Diff: rfc9727xml2.original.xml

	rfc9727xml2.original.xml	rfc9727.xml

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	<?rfc tocindent="yes"?>	<rfc xmlns:xi="http://www.w3.org/2001/XInclude" ipr="trust200902" submissionType
	<?rfc strict="yes"?>	="IETF" docName="draft-ietf-httpapi-api-catalog-08" number="9727" category="std"
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	<rfc ipr="trust200902" docName="draft-ietf-httpapi-api-catalog-08" category="std " consensus="true" tocInclude="true" sortRefs="true" symRefs="true">
	<front>	<front>

	<title abbrev="api-catalog well-known URI">api-catalog: a well-known URI and	<title abbrev="api-catalog: A Well-Known URI">api-catalog: A Well-Known URI
	link relation to help discovery of APIs</title>	and Link Relation to Help Discovery of APIs</title>
		<seriesInfo name="RFC" value="9727"/>
	<author initials="K." surname="Smith" fullname="Kevin Smith">	<author initials="K." surname="Smith" fullname="Kevin Smith">
	<organization>Vodafone</organization>	<organization>Vodafone</organization>
	<address>	<address>
	<email>kevin.smith@vodafone.com</email>	<email>kevin.smith@vodafone.com</email>
	<uri>https://www.vodafone.com</uri>	<uri>https://www.vodafone.com</uri>
	</address>	</address>
	</author>	</author>

		<date month="June" year="2025"/>
		<area>WIT</area>
		<workgroup>httpapi</workgroup>


	<date />	<keyword>API</keyword>

	<area>IETF</area>

	<keyword>internet-draft</keyword>

	<abstract>	<abstract>

		<t>This document defines the "api-catalog" well-known URI and link
	<?line 83?>	relation. It is intended to facilitate automated discovery and usage of
		published Application Programming Interfaces (APIs). A request to the
	<t>This document defines the "api-catalog" well-known URI and link	api-catalog resource will return a document providing information about,
	relation. It is intended to facilitate automated discovery and	and links to, the Publisher's APIs.</t>
	usage of published APIs. A request to the api-catalog resource
	will return a document providing information about, and links to,
	the publisher's APIs.</t>

	</abstract>	</abstract>


	<note title="About This Document" removeInRFC="true">
	<t>
	The latest revision of this draft can be found at <eref target="https://
	ietf-wg-httpapi.github.io/api-catalog/draft-ietf-httpapi-api-catalog.html"/>.
	Status information for this document may be found at <eref target="https
	://datatracker.ietf.org/doc/draft-ietf-httpapi-api-catalog/"/>.
	</t>
	<t>
	Discussion of this document takes place on the
	Building Blocks for HTTP APIs Working Group mailing list (<eref target="
	mailto:httpapi@ietf.org"/>),
	which is archived at <eref target="https://mailarchive.ietf.org/arch/bro
	wse/httpapi/"/>.
	Subscribe at <eref target="https://www.ietf.org/mailman/listinfo/httpapi
	/"/>.
	</t>
	<t>Source for this draft and an issue tracker can be found at
	<eref target="https://github.com/ietf-wg-httpapi/api-catalog"/>.</t>
	</note>

	</front>	</front>


	<middle>	<middle>


	<?line 91?>	<section anchor="introduction">
		<name>Introduction</name>
	<section anchor="introduction"><name>Introduction</name>	<t>An application may publish APIs

	<t>An application may publish Application Programming Interfaces (APIs)
	to encourage requests for interaction from external parties. Such	to encourage requests for interaction from external parties. Such

	APIs must be discovered before they may be used - i.e., the external	APIs must be discovered before they may be used, i.e., the external
	party needs to know what APIs a given publisher exposes, their	party needs to know what APIs a given Publisher exposes, their
	purpose, any policies for usage, and the endpoint to interact with	purpose, any policies for usage, and the endpoint to interact with

	each API. To facilitate automated discovery of this information,	each API. To facilitate automated discovery of this information
	and automated usage of the APIs, this document proposes:</t>	and automated usage of the APIs, this document proposes:</t>

		<ul spacing="normal">
	<t><list style="symbols">	<li>
	<t>a well-known URI <xref target="WELL-KNOWN"/>, 'api-catalog', encoded as a U	<t>a well-known URI <xref target="RFC8615"/>, "api-catalog", that is e
	RI	ncoded as a URI
	reference to an API catalog document describing a Publisher's API	reference to an API catalog document describing a Publisher's API
	endpoints.</t>	endpoints.</t>

	<t>a link relation <xref target="WEB-LINKING"/>, 'api-catalog', of which the t	</li>
	arget	<li>
		<t>a link relation <xref target="RFC8288"/>, "api-catalog", of which t
		he target
	resource is the Publisher's API catalog document.</t>	resource is the Publisher's API catalog document.</t>

	</list></t>	</li>
		</ul>
	<section anchor="goals"><name>Goals and non-goals</name>	<section anchor="goals">
		<name>Goals and Non-Goals</name>
	<t>The primary goal is to facilitate the automated discovery of a	<t>The primary goal of this document is to facilitate the automated discovery
	Publisher's public API endpoints, along with metadata that describes	of a Publisher's public API endpoints, along with metadata that describes the
	the purpose and usage of each API, by specifying a well-known URI	purpose and usage of each API, by specifying a well-known URI that returns an
	that returns an API catalog document. The API catalog document is	API catalog document. The API catalog document is primarily machine-readable
	primarily machine-readable to enable automated discovery and usage of	to enable automated discovery and usage of APIs, and it may also include links
	APIs, and it may also include links to human-readable documentation	to human-readable documentation (see the example in <xref
	(see the example in <xref target="api-catalog-example-rfc8615"/>).</t>	target="api-catalog-example-rfc8615"/>).</t>
		<t>Non-goals: This document does not mandate paths for API endpoints, i.
	<t>Non-goals: this document does not mandate paths for API endpoints.	e., it does not mandate that my_example_api's endpoint should be
	i.e., it does not mandate that my_example_api's endpoint should be	<tt>https://www.example.com/.well-known/api-catalog/my_example_api</tt>, nor
	<spanx style="verb">https://www.example.com/.well-known/api-catalog/my_example_a
	pi</spanx>, nor
	even to be hosted at www.example.com (although it is not forbidden to	even to be hosted at www.example.com (although it is not forbidden to
	do so).</t>	do so).</t>

		</section>
	</section>	<section anchor="notational-conventions">
	<section anchor="notational-conventions"><name>Notational Conventions</name>	<name>Notational Conventions</name>
		<t>The key words "<bcp14>MUST</bcp14>", "<bcp14>MUST NOT</bcp14>", "<bcp
	<t>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL	14>REQUIRED</bcp14>", "<bcp14>SHALL</bcp14>", "<bcp14>SHALL
	NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED",	NOT</bcp14>", "<bcp14>SHOULD</bcp14>", "<bcp14>SHOULD NOT</bcp14>", "<bcp14>RECO
	"MAY", and "OPTIONAL" in this document are to be interpreted as	MMENDED</bcp14>", "<bcp14>NOT RECOMMENDED</bcp14>",
	described in BCP 14 <xref target="RFC2119"/> <xref target="RFC8174"/> when, and	"<bcp14>MAY</bcp14>", and "<bcp14>OPTIONAL</bcp14>" in this document are to be i
	only when, they	nterpreted as
		described in BCP 14 <xref target="RFC2119"/> <xref target="RFC8174"/> when, and
		only when, they
	appear in all capitals, as shown here.	appear in all capitals, as shown here.
	These words may also appear in this document in	These words may also appear in this document in
	lower case as plain English words, absent their normative meanings.	lower case as plain English words, absent their normative meanings.

	<?line -8?></t>	</t>
		<t>The terms "content negotiation" and "status code" are from <xref targ
	<t>The terms "content negotiation" and "status code" are from <xref target="HTTP	et="RFC9110"/>.
	"/>.	The term "well-known URI" is from <xref target="RFC8615"/>.
	The term "well-known URI" is from <xref target="WELL-KNOWN"/>.	The term "link relation" is from <xref target="RFC8288"/>.</t>
	The term "link relation" is from <xref target="WEB-LINKING"/>.</t>	<t>The term "Publisher" refers to an organisation, company, or
		individual that publishes one or more APIs for use by external third
	<t>The term "Publisher" refers to an organisation, company or individual	parties. A fictional Publisher named "example" is used throughout
	that publishes one or more APIs for usage by external third parties.	this document. The examples use the Fully Qualified Domain Names
	A fictional Publisher named "example" is used throughout this document.	(FQDNs) "www.example.com", "developer.example.com", "apis.example.com",
	The examples use the FQDNs "www.example.com", "developer.example.com"	"apis.example.net", "gaming.example.com", and
	,"apis.example.com", "apis.example.net", "gaming.example.com",	"iot.example.net", where the .com and .net Top-Level Domains (TLDs) and
	"iot.example.net",where the use of the .com and .net TLDs and various	various
	subdomains are simply to illustrate that the "example" Publisher may	subdomains are simply used to illustrate that the "example" Publisher ma
	have their API portfolio distributed across various domains for which	y
	they are the authority. For scenarios where the Publisher "example"	have their API portfolio distributed across various domains for which
	is not the authority for a given <em>.example.</em> domain then that is made	they are the authority.
	explicit in the text.</t>	Scenarios where the Publisher "example" is
		not the authority for a given <em>.example.</em> domain are
	<t>In this document, "API" means the specification resources required	made explicit in the text.</t>
	for an external party (or in the case of 'private' APIs, an internal	<t>In this document, "API" refers to the specification resources require
	party) to implement software which uses the Publisher's Application	d
	Programming Interface.</t>	for an external party (or in the case of "private" APIs, an internal
		party) to implement software that uses the Publisher's API.</t>
	<t>The specification recommends the use of TLS, hence "HTTPS" and	<t>The specification recommends the use of TLS. Hence, "HTTPS" and
	"https://" are used throughout.</t>	"https://" are used throughout.</t>

		</section>
	</section>	</section>
	</section>	<section anchor="usage">
	<section anchor="usage"><name>Using the 'api-catalog' well-known URI</name>	<name>Using the "api-catalog" Well-Known URI</name>
		<t>The api-catalog well-known URI is intended for HTTPS servers that
	<t>The api-catalog well-known URI is intended for HTTPS servers that
	publish APIs.</t>	publish APIs.</t>

		<ul spacing="normal">
	<t><list style="symbols">	<li>
	<t>The API catalog MUST be named "api-catalog" in a well-known location	<t>The API catalog <bcp14>MUST</bcp14> be named "api-catalog" in a wel
	as described by <xref target="WELL-KNOWN"/>.</t>	l-known location
	<t>The location of the API catalog document is decided by the Publisher:	as described by <xref target="RFC8615"/>.</t>
	the /.well-known/api-catalog URI provides a convenient reference to	</li>
		<li>
		<t>The location of the API catalog document is decided by the Publishe
		r.
		The /.well-known/api-catalog URI provides a convenient reference to
	that location.</t>	that location.</t>

	</list></t>	</li>
		</ul>
	<t>A Publisher supporting this URI:</t>	<t>A Publisher supporting this URI:</t>
		<ul spacing="normal">
	<t><list style="symbols">	<li>
	<t>SHALL resolve an HTTPS GET request to /.well-known/api-catalog and	<t><bcp14>SHALL</bcp14> resolve an HTTPS GET request to /.well-known/a
	return an API catalog document ( as described in <xref target="api-catalog"/> ).	pi-catalog and
	</t>	return an API catalog document (as described in <xref target="api-catalog"/>).</
	<t>SHALL resolve an HTTPS HEAD request to /.well-known/api-catalog	t>
		</li>
		<li>
		<t><bcp14>SHALL</bcp14> resolve an HTTPS HEAD request to /.well-known/
		api-catalog
	with a response including a Link header with the relation(s) defined	with a response including a Link header with the relation(s) defined

	in <xref target="link-relation"/></t>	in <xref target="link-relation"/>.</t>
	</list></t>	</li>
		</ul>
	</section>	</section>
	<section anchor="link-relation"><name>The api-catalog link relation</name>	<section anchor="link-relation">
		<name>The api-catalog Link Relation</name>
	<t>This document introduces a new link relation <xref target="WEB-LINKING"/>,	<t>This document introduces a new link relation <xref target="RFC8288"/>,
	"api-catalog". This identifies a target resource that represents a	"api-catalog". This identifies a target resource that represents a
	list of APIs available from the Publisher of the link context.	list of APIs available from the Publisher of the link context.

	The target resource URI may be /.well-known/api-catalog , or any	The target resource URI may be /.well-known/api-catalog or any
	other URI chosen by the Publisher. For example, the Publisher	other URI chosen by the Publisher. For example, the Publisher

	'example' could include the api-catalog link relation in the HTTP	"example" could include the api-catalog link relation in the HTTP
	header and/or content payload when responding to a request to	header and/or content payload when responding to a request to

	<spanx style="verb">https://www.example.com</spanx> :</t>	<tt>https://www.example.com</tt>:</t>
		<sourcecode type="http-message"><![CDATA[
	<figure><sourcecode type="http-message"><![CDATA[
	HTTP/1.1 200 OK	HTTP/1.1 200 OK
	Content-Type: text/html; charset=UTF-8	Content-Type: text/html; charset=UTF-8
	Location: /index.html	Location: /index.html
	Link: </my_api_catalog.json>; rel=api-catalog	Link: </my_api_catalog.json>; rel=api-catalog
	Content-Length: 356	Content-Length: 356

	<!DOCTYPE HTML>	<!DOCTYPE HTML>
	<html>	<html>
	<head>	<head>
	<title>Welcome to Example Publisher</title>	<title>Welcome to Example Publisher</title>
	</head>	</head>
	<body>	<body>
	<p>	<p>
	<a href="my_api_catalog.json" rel="api-catalog">	<a href="my_api_catalog.json" rel="api-catalog">
	Example Publisher's APIs	Example Publisher's APIs
	</a>	</a>
	</p>	</p>
	<p>(remainder of content)</p>	<p>(remainder of content)</p>
	</body>	</body>
	</html>	</html>

		]]></sourcecode>
	]]></sourcecode></figure>	<section anchor="using-additional-link-relations">
		<name>Using Additional Link Relations</name>
	<section anchor="using-additional-link-relations"><name>Using additional link re	<t>When used in an API catalog document, the "item" <xref target="RF
	lations</name>	C6573"/> link relation identifies a target resource that represents an

	<t><list style="symbols">
	<t>"item" <xref target="RFC6573"/>. When used in an API catalog document, the
	"item" link relation identifies a target resource that represents an
	API that is a member of the API catalog.</t>	API that is a member of the API catalog.</t>

	<t>Other link relations may be utilised in an API catalog to convey	<t>Other link relations may be utilised in an API catalog to convey
	metadata descriptions for API links.</t>	metadata descriptions for API links.</t>

	</list></t>	</section>
		</section>
	</section>	<section anchor="api-catalog">
	</section>	<name>The API Catalog Document</name>
	<section anchor="api-catalog"><name>The API catalog document</name>	<t>The API catalog is a document listing a Publisher's APIs. The

	<t>The API catalog is a document listing a Publisher's APIs. The
	Publisher may host the API catalog document at any URI(s)	Publisher may host the API catalog document at any URI(s)

	they choose. As illustration, the API catalog document URI of	they choose.
	<spanx style="verb">https://www.example.com/my_api_catalog.json</spanx> can be r	For example, the API catalog document URI of
	equested	<tt>https://www.example.com/my_api_catalog.json</tt> can be requested directl
	directly, or via a request to	y or
	<spanx style="verb">https://www.example.com/.well-known/api-catalog</spanx>, whi	via a request to <tt>https://www.example.com/.well-known/api-catalog</tt>, wh
	ch the	ich
	Publisher will resolve to <spanx style="verb">https://www.example.com/my_api_cat	the Publisher will resolve to <tt>https://www.example.com/my_api_catalog</tt>
	alog</spanx>.</t>	.</t>
		<section anchor="api-catalog-contents">
	<section anchor="api-catalog-contents"><name>API catalog contents</name>	<name>API Catalog Contents</name>


	<t>The API catalog MUST include hyperlinks to API endpoints,	<t> The API catalog <bcp14>MUST</bcp14> include hyperlinks to API
	and is RECOMMENDED to include useful metadata, such as usage	endpoints. It is <bcp14>RECOMMENDED</bcp14> that the API catalog also includes
	policies, API version information, links to the OpenAPI Specification	useful metadata, such as usage policies, API version information, links to the
	<xref target="OAS"></xref> definitions for each API, etc. If the Publisher does	OpenAPI Specification <xref target="OAS"/> definitions for each API, etc. If the
	not	Publisher does not
	include that metadata directly in the API catalog document, they	include that metadata directly in the API catalog document, they

	SHOULD make that metadata available at the API endpoint URIs they	<bcp14>SHOULD</bcp14> make that metadata available at the API endpoint URIs they
	have listed (see <xref target="api-catalog-example-linkset-bookmarks"/> for	have listed (see <xref target="api-catalog-example-linkset-bookmarks"/> for
	an example).</t>	an example).</t>

		</section>
	</section>	<section anchor="api-catalog-formats">
	<section anchor="api-catalog-formats"><name>API catalog formats</name>	<name>API Catalog Formats</name>
		<t>The Publisher <bcp14>MUST</bcp14> publish the API catalog document in
	<t>The Publisher MUST publish the API catalog document in the Linkset	the Linkset
	format <spanx style="verb">application/linkset+json</spanx> (section 4.2 of <xre	format <tt>application/linkset+json</tt> (<xref section="4.2" sectionFormat="of"
	f target="RFC9264"/>).	target="RFC9264"/>).
	The Linkset SHOULD include a profile parameter (section 5 of	The Linkset <bcp14>SHOULD</bcp14> include a profile parameter (<xref section="5"
	<xref target="RFC9264"/>) with a Profile URI <xref target="RFC7284"/> value of '	sectionFormat="of" target="RFC9264"/>) with a Profile URI <xref target="RFC7284
	THIS-RFC-URL'	"/> value of "https://www.rfc-editor.org/info/rfc9727"
	to indicate the Linkset is representing an API catalog document as	to indicate the Linkset is representing an API catalog document as

	defined above. Appendix A includes example API catalog documents	defined above. <xref target="api-catalog-example-linkset"/> includes example API catalog documents
	based on the Linkset format.</t>	based on the Linkset format.</t>


	<t>The Publisher MAY make additional formats available via	<t>The Publisher <bcp14>MAY</bcp14> make additional formats available vi
	content negotiation (section 5.3 of <xref target="HTTP"/>) to their	a
		content negotiation (<xref section="12" sectionFormat="of" target="RFC9110"/>) t
		o their
	/.well-known/api-catalog location. A non-exhaustive list of such	/.well-known/api-catalog location. A non-exhaustive list of such

	formats that support the automated discovery, and machine (and	formats that support the automated discovery and machine (and
	human) usage of a Publisher's APIs, is listed at	human) usage of a Publisher's APIs is listed at
	<xref target="api-catalog-other-formats"/>. If a Publisher already lists their	<xref target="api-catalog-other-formats"/>. If a Publisher already lists their

	APIs in a format other than Linkset but wish to utilise the	APIs in a format other than Linkset, but wishes to utilise the
	/.well-known/api-catalog URI, then:</t>	/.well-known/api-catalog URI, then:</t>

		<ul spacing="normal">
	<t><list style="symbols">	<li>
	<t>They MUST also implement a Linkset with, at minimum, hyperlinks to	<t>They <bcp14>MUST</bcp14> also implement a Linkset with, at minimu
	API endpoints - see the example of	m, hyperlinks to
	<xref target="api-catalog-example-linkset-bookmarks"/> in Appendix A.</t>	API endpoints; see <xref target="api-catalog-example-linkset-bookmarks"/>.</t>
	<t>They MAY support content negotiation at the	</li>
	/.well-known/api-catalog URI to allow their existing format to be	<li>
	returned.</t>	<t>They <bcp14>MAY</bcp14> support content negotiation at the
	</list></t>	/.well-known/api-catalog URI to allow for the return of their existing format.</
		t>
	</section>	</li>
	<section anchor="nest"><name>Nesting API catalog links</name>	</ul>
		</section>
	<t>An API catalog may itself contain links to other API catalogs, by	<section anchor="nest">
	using the 'api-catalog' relation type for each link.	<name>Nesting API Catalog Links</name>
	An example of this is given in	<t>An API catalog may itself contain links to other API catalogs by usin
	<xref target="api-catalog-example-linkset-nesting"/>.</t>	g
		the "api-catalog" relation type for each link. An example of this is
	</section>	given in <xref target="api-catalog-example-linkset-nesting"/>.</t>
	</section>	</section>
	<section anchor="operations"><name>Operational considerations</name>	</section>
		<section anchor="operations">
	<section anchor="multiple_domains"><name>Accounting for APIs distributed across	<name>Operational Considerations</name>
	multiple domains</name>	<section anchor="multiple_domains">
		<name>Accounting for APIs Distributed Across Multiple Domains</name>
	<t>A Publisher ("example") may have their APIs hosted across multiple	<t>A Publisher ("example") may have their APIs hosted across multiple
	domains that they manage: e.g., at <spanx style="verb">www.example.com</spanx>,	domains that they manage, e.g., at <tt>www.example.com</tt>,
	<spanx style="verb">developer.example.com</spanx>, <spanx style="verb">apis.exam	<tt>developer.example.com</tt>, <tt>apis.example.com</tt>,
	ple.com</spanx>,	<tt>apis.example.net</tt>, etc. They may also use a third-party API
	<spanx style="verb">apis.example.net</spanx> etc. They may also use a third-part	hosting provider that hosts APIs on a distinct domain.</t>
	y API	<t>To account for this scenario, it is <bcp14>RECOMMENDED</bcp14> that:<
	hosting provider which hosts APIs on a distinct domain.</t>	/t>
		<ul spacing="normal">
	<t>To account for this scenario, it is RECOMMENDED that:</t>	<li>
		<t>The Publisher also publish the api-catalog well-known URI at each
	<t><list style="symbols">	of their API domains, e.g., <tt>https://apis.example.com/.well-known/api-catalo
	<t>The Publisher also publish the api-catalog well-known URI at each	g</tt>,
	of their API domains e.g.	<tt>https://developer.example.net/.well-known/api-catalog</tt>, etc.</t>
	<spanx style="verb">https://apis.example.com/.well-known/api-catalog</spanx>,	</li>
	<spanx style="verb">https://developer.example.net/.well-known/api-catalog</span	<li>
	x> etc.</t>	<t>An HTTPS GET request to any of these URIs returns the same result
	<t>An HTTPS GET request to any of these URIs returns the same result,	,
	namely, the API catalog document.</t>	namely, the API catalog document.</t>

	<t>Since the physical location of the API catalog document is decided	</li>
	by the Publisher, and may change, the Publisher choose one of their	<li>
		<t>The Publisher choose one of their
	instances of /.well-known/api-catalog as a canonical reference to	instances of /.well-known/api-catalog as a canonical reference to

	the location of the latest API catalog. The Publisher's other	the location of the latest API catalog since the physical location of the API ca talog document is decided by the Publisher and may change. The Publisher's other
	instances of /.well-known/api-catalog should redirect to this	instances of /.well-known/api-catalog should redirect to this
	canonical instance of /.well-known/api-catalog to ensure the latest	canonical instance of /.well-known/api-catalog to ensure the latest
	API catalog is returned.</t>	API catalog is returned.</t>

	</list></t>	</li>
		</ul>
	<t>For example, if the Publisher's primary API portal is	<t>For example, if the Publisher's primary API portal is
	<spanx style="verb">https://apis.example.com</spanx>, then	<tt>https://apis.example.com</tt>, then
	<spanx style="verb">https://apis.example.com/.well-known/api-catalog</spanx> sho	<tt>https://apis.example.com/.well-known/api-catalog</tt> should resolve to
	uld resolve to
	the location of the Publisher's latest API catalog document. If the	the location of the Publisher's latest API catalog document. If the

	Publisher is also the domain authority for <spanx style="verb">www.example.net</ spanx>,	Publisher is also the domain authority for <tt>www.example.net</tt>,
	which also hosts a selection of their APIs, then a request to	which also hosts a selection of their APIs, then a request to

	<spanx style="verb">https://www.example.net/.well-known/api-catalog</spanx> shou	<tt>https://www.example.net/.well-known/api-catalog</tt> should redirect
	ld redirect	to <tt>https://apis.example.com/.well-known/api-catalog</tt>.</t>
	to <spanx style="verb">https://apis.example.com/.well-known/api-catalog</spanx>
	.</t>


	<t>If the Publisher is not the domain authority for	<t>If the Publisher is not the domain authority for <tt>www.example.net</tt>,
	<spanx style="verb">www.example.net</spanx> - or any third-party domain that hos	then the Publisher’s API Catalog <bcp14>MAY</bcp14> include a link to the
	ts any	API catalog of the third-party that is the domain authority for <tt>www.exampl
	of the Publisher's APIs - then the Publisher MAY include a link in	e.net</tt>. For example, the API catalog available
	its own API catalog to that third-party domain's API catalog.	at <tt>https://apis.example.com/.well-known/api-catalog</tt> may list APIs
	For example, the API catalog available	hosted at <tt>apis.example.com</tt> and also link to the API catalog hosted
	at <spanx style="verb">https://apis.example.com/.well-known/api-catalog</spanx>)	at <tt>https://www.example.net/.well-known/api-catalog</tt> using the
	may list APIs
	hosted at <spanx style="verb">apis.example.com</spanx> and also link to the API
	catalog hosted
	at <spanx style="verb">https://www.example.net/.well-known/api-catalog</spanx> u
	sing the
	"api-catalog" link relation:</t>	"api-catalog" link relation:</t>

		<sourcecode type="json"><![CDATA[
	<figure><sourcecode type="json"><![CDATA[
	{	{
	"linkset": [	"linkset": [
	{	{
	"anchor": "https://www.example.com/.well-known/api-catalog",	"anchor": "https://www.example.com/.well-known/api-catalog",
	"item": [	"item": [
	{	{
	"href": "https://developer.example.com/apis/foo_api"	"href": "https://developer.example.com/apis/foo_api"
	},	},
	{	{
	"href": "https://developer.example.com/apis/bar_api"	"href": "https://developer.example.com/apis/bar_api"
	},	},
	{	{
	"href": "https://developer.example.com/apis/cantona_api"	"href": "https://developer.example.com/apis/cantona_api"
	}	}
	],	],
	"api-catalog": "https://www.example.net/.well-known/api-catalog"	"api-catalog": "https://www.example.net/.well-known/api-catalog"
	}	}
	]	]
	}	}

	]]></sourcecode></figure>	]]></sourcecode>
		</section>
	</section>	<section anchor="internal-use">
	<section anchor="internal-use"><name>Internal use of api-catalog for private API	<name>Internal Use of api-catalog for Private APIs</name>
	s</name>	<t>A Publisher may wish to use the api-catalog well-known URI on their
		internal network to signpost authorised users (e.g., company
	<t>A Publisher may wish to use the api-catalog well-known URI on their
	internal network, to signpost authorised users (e.g. company
	employees) towards internal/private APIs not intended for third-party	employees) towards internal/private APIs not intended for third-party

	use. This scenario may incur additional security considerations, as	use. This scenario may incur additional security considerations as
	noted in <xref target="security"/>.</t>	noted in <xref target="security"/>.</t>

		</section>
	</section>	<section anchor="scalability">
	<section anchor="scalability"><name>Scalability guidelines</name>	<name>Scalability Guidelines</name>
		<t>In cases where a Publisher has a large number of APIs potentially
	<t>In cases where a Publisher has a large number of APIs, potentially	deployed across multiple domains, two challenges may arise:</t>
	deployed across multiple domains, then two challenges may arise:</t>	<ul spacing="normal">
		<li>
	<t><list style="symbols">	<t>Maintaining the catalog entries to ensure they are up to date and
	<t>Maintaining the catalog entries to ensure they are up to date and	correcting any errors.</t>
	any errors corrected.</t>	</li>
	<t>Restricting the catalog size to help reduce network and	<li>
		<t>Restricting the catalog size to help reduce network and
	client-processing overheads.</t>	client-processing overheads.</t>

	</list></t>	</li>
		</ul>
	<t>In both cases a Publisher may benefit from grouping their APIs,	<t>In both cases, a Publisher may benefit from grouping their APIs,
	providing an API catalog document for each group - and use the main	providing an API catalog document for each group and using the main
	API catalog hosted at /.well-known/api-catalog to provide links to	API catalog hosted at /.well-known/api-catalog to provide links to

	these. For example a Publisher may decide to group their APIs	these. For example, a Publisher may decide to group their APIs
	according to a business category (e.g. 'gaming APIs', 'anti-fraud	according to a business category (e.g., "gaming APIs", "anti-fraud
	APIs etc.) or a technology category (e.g. ''IOT', 'networks', 'AI'	APIs", etc.), a technology category (e.g., "IOT", "networks", "AI",
	etc.), or any other criterion. This grouping may already be implicit	etc.), or any other criterion.
	where the Publisher has already published their APIs across multiple
	domains, e.g. at <spanx style="verb">gaming.example.com</spanx>, <spanx style="v
	erb">iot.example.net</spanx>, etc.</t>


	<t><xref target="nest"/> shows how the API catalog at	This grouping may be implicit where the Publisher has already published
		their APIs across multiple domains, e.g., at <tt>gaming.example.com</tt>,
		<tt>iot.example.net</tt>, etc.</t>
		<t><xref target="nest"/> shows how the API catalog at
	/.well-known/api-catalog can use the api-catalog link relation to	/.well-known/api-catalog can use the api-catalog link relation to
	point to other API catalogs.</t>	point to other API catalogs.</t>

		<t>The Publisher <bcp14>SHOULD</bcp14> consider caching and compression
	<t>The Publisher SHOULD consider caching and compression
	techniques to reduce the network overhead of large API catalogs.</t>	techniques to reduce the network overhead of large API catalogs.</t>

		</section>
	</section>	<section anchor="maintenance">
	<section anchor="maintenance"><name>Monitoring and maintenance</name>	<name>Monitoring and Maintenance</name>
		<t>Publishers are <bcp14>RECOMMENDED</bcp14> to follow operational best
	<t>Publishers are RECOMMENDED to follow operational best practice when	practice when
	hosting API catalog(s), including but not limited to:</t>	hosting API catalog(s), including, but not limited to:</t>
		<ul spacing="normal">
	<t><list style="symbols">	<li>
	<t>Availability. The Publisher should monitor availability of the API	<t>Availability. The Publisher should monitor availability of the AP
	catalog, and consider alternate means to resolve requests to	I
		catalog and consider alternate means to resolve requests to
	/.well-known/api-catalog during planned downtime of hosts.</t>	/.well-known/api-catalog during planned downtime of hosts.</t>

	<t>Performance. Although the performance of APIs listed in an API	</li>
		<li>
		<t>Performance. Although the performance of APIs listed in an API
	catalog can demand high transactions per second and low-latency	catalog can demand high transactions per second and low-latency
	response, the retrieval of the API catalog itself to discover those	response, the retrieval of the API catalog itself to discover those
	APIs is less likely to incur strict performance demands. That said,	APIs is less likely to incur strict performance demands. That said,
	the Publisher should monitor the response time to fulfil a request	the Publisher should monitor the response time to fulfil a request

	for the API catalog, and determine any necessary improvements (as	for the API catalog and determine any necessary improvements (as
	with any other Web resource the Publisher serves). For large API	with any other Web resource the Publisher serves). For large API
	catalogs, the Publisher should consider the techniques described in	catalogs, the Publisher should consider the techniques described in
	<xref target="scalability"/>.</t>	<xref target="scalability"/>.</t>

	<t>Usage. Since the goal of the api-catalog well-known URI is to	</li>
		<li>
		<t>Usage. Since the goal of the api-catalog well-known URI is to
	facilitate discovery of APIs, the Publisher may wish to correlate	facilitate discovery of APIs, the Publisher may wish to correlate
	requests to the /.well-known/api-catalog URI with subsequent requests	requests to the /.well-known/api-catalog URI with subsequent requests
	to the API URIs listed in the catalog.</t>	to the API URIs listed in the catalog.</t>

	<t>Current data. The Publisher should include the removal of stale API	</li>
		<li>
		<t>Current data. The Publisher should include the removal of stale A
		PI
	entries from the API catalog as part of their API release lifecycle.	entries from the API catalog as part of their API release lifecycle.

	The Publisher MAY decide to include metadata regarding legacy API	The Publisher <bcp14>MAY</bcp14> decide to include metadata regarding legacy API
	versions or deprecated APIs to help users of those APIs discover	versions or deprecated APIs to help users of those APIs discover
	up-to-date alternatives.</t>	up-to-date alternatives.</t>

	<t>Correct metadata. The Publisher should include human and/or	</li>
		<li>
		<t>Correct metadata. The Publisher should include human and/or
	automated checks for syntax errors in the API catalog. Automated	automated checks for syntax errors in the API catalog. Automated

	checks include format validation (e.g. to ensure valid JSON syntax)	checks include format validation (e.g., to ensure valid JSON syntax)
	and linting to enforce business rules - such as removing duplicate	and linting to enforce business rules, such as removing duplicate
	entries and ensuring descriptions are correctly named with valid	entries and ensuring descriptions are correctly named with valid
	values. A proofread of the API catalog as part of the API release	values. A proofread of the API catalog as part of the API release

	lifecycle is RECOMMENDED to detect any errors in business grammar	lifecycle is <bcp14>RECOMMENDED</bcp14> to detect any errors in business grammar
	(for example, an API entry that is described with valid syntax, but	(for example, an API entry that is described with valid syntax, but
	has been allocated an incorrect or outdated description.)</t>	has been allocated an incorrect or outdated description.)</t>

	<t>Security best practice, as set out in <xref target="security"/>.</t>	</li>
	</list></t>	<li>
		<t>Security best practice. See <xref target="security"/>.</t>
	</section>	</li>
	<section anchor="integration"><name>Integration with existing API management fra	</ul>
	meworks</name>	</section>
		<section anchor="integration">
	<t>A Publisher may already utilise an API management framework to	<name>Integration with Existing API Management Frameworks</name>
		<t>A Publisher may already utilise an API management framework to
	produce their API portfolio. These frameworks typically include the	produce their API portfolio. These frameworks typically include the
	publication of API endpoint URIs, deprecation and redirection of	publication of API endpoint URIs, deprecation and redirection of
	legacy API versions, API usage policies and documentation, etc.	legacy API versions, API usage policies and documentation, etc.
	The api-catalog well-known URI and API catalog document are intended	The api-catalog well-known URI and API catalog document are intended
	to complement API management frameworks by facilitating the discovery	to complement API management frameworks by facilitating the discovery

	of the framework's outputs - API endpoints, usage policies and	of the framework's outputs -- API endpoints, usage policies, and
	documentation - and are not intended to replace any existing	documentation -- and are not intended to replace any existing
	API discovery mechanisms the framework has implemented.</t>	API discovery mechanisms the framework has implemented.</t>

		<t>Providers of such frameworks may include the production of an API
	<t>Providers of such frameworks may include the production of an API
	catalog and the publication of the /.well-known/api-catalog URI as a	catalog and the publication of the /.well-known/api-catalog URI as a
	final pre-release (or post-release) step in the release management	final pre-release (or post-release) step in the release management

	workflow. The following steps are recommended:</t>	workflow. The following steps are recommended.</t>
		<t>If the /.well-known/api-catalog URI has not been published previously
	<t>If the /.well-known/api-catalog URI has not been published previously	, the framework provider should:</t>
	, the framework provider should:</t>	<ul spacing="normal">
		<li>
	<t><list style="symbols">	<t>Collate and check the metadata for each API that will be included
	<t>Collate and check the metadata for each API that will be included
	in the API catalog. This metadata is likely to already exist in the	in the API catalog. This metadata is likely to already exist in the
	framework.</t>	framework.</t>

	<t>Determine which metadata to include in the API catalog, following	</li>
		<li>
		<t>Determine which metadata to include in the API catalog following
	the requirements set out in <xref target="api-catalog-contents"/> and the	the requirements set out in <xref target="api-catalog-contents"/> and the
	considerations set out in <xref target="operations"/>.</t>	considerations set out in <xref target="operations"/>.</t>

	<t>Map the chosen metadata to the format(s) described in	</li>
	<xref target="api-catalog-formats"/>. Where only the hyperlinks to APIs are to b	<li>
	e	<t>Map the chosen metadata to the format(s) described in
	included in the API catalog, then the structure suggested in	<xref target="api-catalog-formats"/>. The structure suggested in
	<xref target="api-catalog-example-linkset-bookmarks"/> may be followed. Where	<xref target="api-catalog-example-linkset-bookmarks"/> may be followed where onl
	possible the API catalog should include further metadata per the	y the hyperlinks to APIs are to be
	guidance in <xref target="api-catalog-contents"/>, in which case the structure	included in the API catalog. Where
		possible, the API catalog should include further metadata per the
		guidance in <xref target="api-catalog-contents"/>; in which case, the structure
	suggested in <xref target="api-catalog-example-linkset"/> can be utilised and	suggested in <xref target="api-catalog-example-linkset"/> can be utilised and
	adapted (ensuring compliance to <xref target="RFC9264"/>) to reflect the nature	adapted (ensuring compliance to <xref target="RFC9264"/>) to reflect the nature
	of the chosen metadata.</t>	of the chosen metadata.</t>

	<t>Publish the /.well-known/api-catalog URI following the guidance set	</li>
		<li>
		<t>Publish the /.well-known/api-catalog URI following the guidance s
		et
	out in <xref target="usage"/>.</t>	out in <xref target="usage"/>.</t>

	</list></t>	</li>
		</ul>
	<t>If the /.well-known/api-catalog URI has previously been published,	<t>If the /.well-known/api-catalog URI has previously been published,
	the framework provider should:</t>	the framework provider should:</t>

		<ul spacing="normal">
	<t><list style="symbols">	<li>
	<t>Include a step in the release management lifecycle to refresh the	<t>Include a step in the release management lifecycle to refresh the
	API catalog following any changes in API hyperlinks or published	API catalog following any changes in API hyperlinks or published
	metadata. This could include placing triggers on certain metadata	metadata. This could include placing triggers on certain metadata
	fields, so that as they are updated in pre-production on the API	fields, so that as they are updated in pre-production on the API
	framework, the updates are pushed to a pre-production copy of the API	framework, the updates are pushed to a pre-production copy of the API
	catalog to be pushed live when the release is published by the	catalog to be pushed live when the release is published by the
	framework.</t>	framework.</t>

	</list></t>	</li>
		</ul>
	</section>	</section>
	</section>	</section>
	<section anchor="conform-rfc8615"><name>Conformance to RFC8615</name>	<section anchor="conform-rfc8615">
		<name>Conformance to RFC 8615</name>
	<t>The requirements in section 3 of <xref target="WELL-KNOWN"/> for defining	<t>The requirements in <xref section="3" sectionFormat="of" target="RFC861
	Well-Known Uniform Resource Identifiers are met as described in the	5"/> for defining
	following sub-sections.</t>	Well-Known URIs are met as described in the
		following subsections.</t>
	<section anchor="path-suffix"><name>Path suffix</name>	<section anchor="path-suffix">
		<name>Path Suffix</name>
	<t>The api-catalog URI SHALL be appended to the /.well-known/	<t>The api-catalog URI <bcp14>SHALL</bcp14> be appended to the /.well-kn
		own/
	path-prefix for "well-known locations".</t>	path-prefix for "well-known locations".</t>

		</section>
	</section>	<section anchor="formats-and-associated-media-types">
	<section anchor="formats-and-associated-media-types"><name>Formats and associate	<name>Formats and Associated Media Types</name>
	d media types</name>	<t>A /.well-known/api-catalog location <bcp14>MUST</bcp14> support the L
		inkset
	<t>A /.well-known/api-catalog location MUST support the Linkset	<xref target="RFC9264"/> format of application/linkset+json and <bcp14>MAY</bcp1
	<xref target="RFC9264"/> format of application/linkset+json, and MAY	4>
	also support the other formats via content negotiation.</t>	also support the other formats via content negotiation.</t>

		</section>


	</section>	</section>
	<section anchor="registration-of-the-api-catalog-well-known-uri"><name>Registrat	<section anchor="iana">
	ion of the api-catalog well-known URI</name>	<name>IANA Considerations</name>
		<section anchor="the-api-catalog-well-known-uri">
	<t>See <xref target="iana"/> considerations below.</t>	<name>The api-catalog Well-Known URI</name>
		<t>This specification registers the "api-catalog" well-known URI in
	</section>	the "Well-Known URIs" registry as defined by <xref
	</section>	target="RFC8615"/>.</t>
	<section anchor="iana"><name>IANA Considerations</name>	<dl spacing="compact" newline="false">
		<dt>URI Suffix:</dt><dd>api-catalog</dd>
	<section anchor="the-api-catalog-well-known-uri"><name>The api-catalog well-know	<dt>Reference:</dt><dd>RFC 9727</dd>
	n URI</name>	<dt>Status:</dt><dd>permanent</dd>
		<dt>Change Controller:</dt><dd>IETF</dd>
	<t>This specification registers the "api-catalog" well-known URI in the	</dl>
	Well-Known URI Registry as defined by <xref target="WELL-KNOWN"/>.</t>	</section>
		<section anchor="the-api-catalog-link-relation">
	<t><list style="symbols">	<name>The api-catalog Link Relation</name>
	<t>URI suffix: api-catalog</t>	<t>This specification registers the "api-catalog" link relation in the "
	<t>Change Controller: IETF</t>	Link Relation Types" registry by
	<t>Specification document(s): THIS-RFC</t>	following the procedures per <xref section="2.1.1.1" sectionFormat="of"
	<t>Status: permanent</t>	target="RFC8288"/>.</t>
	</list></t>	<dl spacing="compact" newline="false">
		<dt>Relation Name:</dt><dd>api-catalog</dd>
	</section>	<dt>Description:</dt><dd>Refers to a list of APIs available from the
	<section anchor="the-api-catalog-link-relation"><name>The api-catalog link relat	Publisher of the link context.</dd>
	ion</name>	<dt>Reference:</dt><dd>RFC 9727</dd>
		</dl>
	<t>This specification registers the "api-catalog" link relation by	</section>
	following the procedures per section 2.1.1.1 of <xref target="WEB-LINKING"/></t>

	<t><list style="symbols">
	<t>Relation Name: api-catalog</t>
	<t>Description: Refers to a list of APIs available from the publisher
	of the link context.</t>
	<t>Reference: THIS-RFC</t>
	</list></t>

	</section>
	<section anchor="the-api-catalog-profile-uri"><name>The api-catalog Profile URI<
	/name>

	<t>This specification registers "THIS-RFC-URL" in the "Profile URIs"
	registry according to <xref target="RFC7284"/>.</t>

	<t><list style="symbols">
	<t>Profile URI: THIS-RFC-URL</t>
	<t>Common Name: API catalog</t>
	<t>Description: A profile URI to request or signal a Linkset
	representing an API catalog.</t>
	<t>Reference: THIS-RFC</t>
	</list></t>

	<t>RFC Editor's Note: IANA is kindly requested to replace all instances
	of THIS-RFC and THIS-RFC-URL with the actual RFC number/URL once
	assigned.</t>

	</section>
	</section>
	<section anchor="security"><name>Security Considerations</name>

	<t>For all scenarios:</t>


	<t><list style="symbols">	<section anchor="the-api-catalog-profile-uri">
	<t>TLS SHOULD be used, i.e. make /.well-known/api-catalog available	<name>The api-catalog Profile URI</name>
	exclusively over HTTPS, to ensure no tampering of the API catalog</t>	<t>This specification registers "https://www.rfc-editor.org/info/rfc9727
	<t>The Publisher SHOULD take into account the Security Considerations	" in the "Profile URIs"
	from section 4 of <xref target="WELL-KNOWN"/>.</t>	registry according to <xref target="RFC7284"/>.</t>
	<t>The Publisher SHOULD perform a security and privacy review of the	<dl spacing="compact" newline="false">
	API catalog prior to deployment, to ensure it does not leak personal,	<dt>Profile URI:</dt><dd>https://www.rfc-editor.org/info/rfc9727</dd>
	business or other sensitive metadata, nor expose any vulnerability	<dt>Common Name:</dt><dd>API catalog</dd>
		<dt>Description:</dt><dd>A Profile URI to request or signal a
		Linkset representing an API catalog.</dd>
		<dt>Reference:</dt><dd>RFC 9727</dd>
		</dl>
		</section>
		</section>
		<section anchor="security">
		<name>Security Considerations</name>
		<t>For all scenarios:</t>
		<ul spacing="normal">
		<li>
		<t>TLS <bcp14>SHOULD</bcp14> be used, i.e., make /.well-known/api-cata
		log available
		exclusively over HTTPS, to ensure no tampering of the API catalog.</t>
		</li>
		<li>
		<t>The Publisher <bcp14>SHOULD</bcp14> take into account the security
		considerations
		from <xref section="4" sectionFormat="of" target="RFC8615"/>.</t>
		</li>
		<li>
		<t>The Publisher <bcp14>SHOULD</bcp14> perform a security and privacy
		review of the
		API catalog prior to deployment to ensure it does not leak personal,
		business, or other sensitive metadata, nor expose any vulnerability
	related to the APIs listed.</t>	related to the APIs listed.</t>

	<t>The Publisher SHOULD enforce read-only privileges for external	</li>
	requests to .well-known/api-catalog, and for internal systems and	<li>
		<t>The Publisher <bcp14>SHOULD</bcp14> enforce read-only privileges fo
		r external
		requests to .well-known/api-catalog and for internal systems and
	roles that monitor the .well-known/api-catalog URI. Write privileges	roles that monitor the .well-known/api-catalog URI. Write privileges

	SHOULD only be granted to roles that perform updates to the API	<bcp14>SHOULD</bcp14> only be granted to roles that perform updates to the API
	catalog and/or the forwarding rewrite rules for the	catalog and/or the forwarding rewrite rules for the
	.well-known/api-catalog URI.</t>	.well-known/api-catalog URI.</t>

	<t>As with any Web offering, it is RECOMMENDED to apply rate-limiting	</li>
	measures to help mitigate abuse and prevent Denial-of-Service	<li>
		<t>As with any Web offering, it is <bcp14>RECOMMENDED</bcp14> to apply
		rate-limiting
		measures to help mitigate abuse and prevent denial-of-service
	attacks on the API catalog endpoint.</t>	attacks on the API catalog endpoint.</t>

	</list></t>	</li>
		</ul>
	<t>For the public-facing APIs scenario: security teams SHOULD	<t>For the public-facing APIs scenario, security teams <bcp14>SHOULD</bcp1
		4>
	additionally audit the API catalog to ensure no APIs intended solely	additionally audit the API catalog to ensure no APIs intended solely
	for internal use have been mistakenly included. For example, a	for internal use have been mistakenly included. For example, a

	catalog hosted on <spanx style="verb">https://developer.example.com</spanx> shou ld not expose	catalog hosted on <tt>https://developer.example.com</tt> should not expose
	unnecessary metadata about any internal domains	unnecessary metadata about any internal domains

	(e.g. <spanx style="verb">https://internal.example.com</spanx>).</t>	(e.g., <tt>https://internal.example.com</tt>).</t>
		<t>For the internal/private APIs scenario, the Publisher <bcp14>SHOULD</bc
	<t>For the internal/private APIs scenario: the Publisher SHOULD take	p14> take
	steps to ensure that appropriate controls - such as CORS policies and	steps to ensure that appropriate controls, such as Cross-Origin Resource Sharing
	access control lists - are in place to ensure only authorised roles	(CORS) policies and
		access control lists, are in place to ensure only authorised roles
	and systems may access an internal api-catalog well-known URI.</t>	and systems may access an internal api-catalog well-known URI.</t>

		<t>A comprehensive API catalog that is regularly audited may assist
	<t>A comprehensive API catalog that is regularly audited may assist	the Publisher in decommissioning "zombie" APIs, i.e., legacy/obsolete
	the Publisher in decommissioning 'zombie' APIs i.e., legacy/obsolete
	APIs that should no longer be available. Such APIs represent a	APIs that should no longer be available. Such APIs represent a
	security vulnerability as they are unlikely to be supported,	security vulnerability as they are unlikely to be supported,

	monitored, patched or updated.</t>	monitored, patched, or updated.</t>
		<t>Note the registration of domain names and associated policies is out
	<t>Note the registration of domain names and associated policies is out
	of scope of this document.</t>	of scope of this document.</t>

		</section>
	</section>

	</middle>	</middle>


	<back>	<back>

		<displayreference target="RFC9110" to="HTTP"/>
		<displayreference target="RFC8288" to="WEB-LINKING"/>
		<displayreference target="RFC8615" to="WELL-KNOWN"/>
		<displayreference target="I-D.kelly-json-hal" to="HAL"/>
		<references>
		<name>References</name>
		<references anchor="sec-normative-references">
		<name>Normative References</name>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9
		110.xml"/>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8
		615.xml"/>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8
		288.xml"/>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2
		119.xml"/>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8
		174.xml"/>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6
		573.xml"/>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9
		264.xml"/>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.7
		284.xml"/>
		</references>
		<references anchor="sec-informative-references">
		<name>Informative References</name>


	<references title='Normative References' anchor="sec-normative-references">	<reference anchor="OAS" target="https://spec.openapis.org/oas/latest">
		<front>
	<reference anchor="HTTP">	<title>OpenAPI Specification v3.1.0</title>
	<front>	<author initials="D" surname="Miller" role="editor">
	<title>HTTP Semantics</title>	<organization/>
	<author fullname="R. Fielding" initials="R." role="editor" surname="Fielding	</author>
	"/>	<author initials="H" surname="Andrews" role="editor">
	<author fullname="M. Nottingham" initials="M." role="editor" surname="Nottin	<organization/>
	gham"/>	</author>
	<author fullname="J. Reschke" initials="J." role="editor" surname="Reschke"/	<author initials="J" surname="Whitlock" role="editor">
	>	<organization/>
	<date month="June" year="2022"/>	</author>
	<abstract>	<author initials="L" surname="Mitchell" role="editor">
	<t>The Hypertext Transfer Protocol (HTTP) is a stateless application-level	<organization/>
	protocol for distributed, collaborative, hypertext information systems. This do	</author>
	cument describes the overall architecture of HTTP, establishes common terminolog	<author initials="M" surname="Gardiner" role="editor">
	y, and defines aspects of the protocol that are shared by all versions. In this	<organization/>
	definition are core protocol elements, extensibility mechanisms, and the "http"	</author>
	and "https" Uniform Resource Identifier (URI) schemes.</t>	<author initials="M" surname="Quintero" role="editor">
	<t>This document updates RFC 3864 and obsoletes RFCs 2818, 7231, 7232, 723	<organization/>
	3, 7235, 7538, 7615, 7694, and portions of 7230.</t>	</author>
	</abstract>	<author initials="M" surname="Kistler" role="editor">
	</front>	<organization/>
	<seriesInfo name="STD" value="97"/>	</author>
	<seriesInfo name="RFC" value="9110"/>	<author initials="R" surname="Handl" role="editor">
	<seriesInfo name="DOI" value="10.17487/RFC9110"/>	<organization/>
	</reference>	</author>
	<reference anchor="WELL-KNOWN">	<author initials="R" surname="Ratovsky" role="editor">
	<front>	<organization/>
	<title>Well-Known Uniform Resource Identifiers (URIs)</title>	</author>
	<author fullname="M. Nottingham" initials="M." surname="Nottingham"/>	<date year="2024" month="October" day="24"/>
	<date month="May" year="2019"/>	</front>
	<abstract>	<annotation>Latest version available at <eref
	<t>This memo defines a path prefix for "well-known locations", "/.well-kno	target="https://spec.openapis.org/oas/latest.html" brackets="angle"/>.
	wn/", in selected Uniform Resource Identifier (URI) schemes.</t>	</annotation>
	<t>In doing so, it obsoletes RFC 5785 and updates the URI schemes defined	</reference>
	in RFC 7230 to reserve that space. It also updates RFC 7595 to track URI schemes
	that support well-known URIs in their registry.</t>
	</abstract>
	</front>
	<seriesInfo name="RFC" value="8615"/>
	<seriesInfo name="DOI" value="10.17487/RFC8615"/>
	</reference>
	<reference anchor="WEB-LINKING">
	<front>
	<title>Web Linking</title>
	<author fullname="M. Nottingham" initials="M." surname="Nottingham"/>
	<date month="October" year="2017"/>
	<abstract>
	<t>This specification defines a model for the relationships between resour
	ces on the Web ("links") and the type of those relationships ("link relation typ
	es").</t>
	<t>It also defines the serialisation of such links in HTTP headers with th
	e Link header field.</t>
	</abstract>
	</front>
	<seriesInfo name="RFC" value="8288"/>
	<seriesInfo name="DOI" value="10.17487/RFC8288"/>
	</reference>
	<reference anchor="RFC2119">
	<front>
	<title>Key words for use in RFCs to Indicate Requirement Levels</title>
	<author fullname="S. Bradner" initials="S." surname="Bradner"/>
	<date month="March" year="1997"/>
	<abstract>
	<t>In many standards track documents several words are used to signify the
	requirements in the specification. These words are often capitalized. This docu
	ment defines these words as they should be interpreted in IETF documents. This d
	ocument specifies an Internet Best Current Practices for the Internet Community,
	and requests discussion and suggestions for improvements.</t>
	</abstract>
	</front>
	<seriesInfo name="BCP" value="14"/>
	<seriesInfo name="RFC" value="2119"/>
	<seriesInfo name="DOI" value="10.17487/RFC2119"/>
	</reference>
	<reference anchor="RFC8174">
	<front>
	<title>Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words</title>
	<author fullname="B. Leiba" initials="B." surname="Leiba"/>
	<date month="May" year="2017"/>
	<abstract>
	<t>RFC 2119 specifies common key words that may be used in protocol specif
	ications. This document aims to reduce the ambiguity by clarifying that only UPP
	ERCASE usage of the key words have the defined special meanings.</t>
	</abstract>
	</front>
	<seriesInfo name="BCP" value="14"/>
	<seriesInfo name="RFC" value="8174"/>
	<seriesInfo name="DOI" value="10.17487/RFC8174"/>
	</reference>
	<reference anchor="RFC6573">
	<front>
	<title>The Item and Collection Link Relations</title>
	<author fullname="M. Amundsen" initials="M." surname="Amundsen"/>
	<date month="April" year="2012"/>
	<abstract>
	<t>RFC 5988 standardized a means of indicating the relationships between r
	esources on the Web. This specification defines a pair of reciprocal link relati
	on types that may be used to express the relationship between a collection and i
	ts members. This document is not an Internet Standards Track specification; it i
	s published for informational purposes.</t>
	</abstract>
	</front>
	<seriesInfo name="RFC" value="6573"/>
	<seriesInfo name="DOI" value="10.17487/RFC6573"/>
	</reference>
	<reference anchor="RFC9264">
	<front>
	<title>Linkset: Media Types and a Link Relation Type for Link Sets</title>
	<author fullname="E. Wilde" initials="E." surname="Wilde"/>
	<author fullname="H. Van de Sompel" initials="H." surname="Van de Sompel"/>
	<date month="July" year="2022"/>
	<abstract>
	<t>This specification defines two formats and associated media types for r
	epresenting sets of links as standalone documents. One format is based on JSON,
	and the other is aligned with the format for representing links in the HTTP "Lin
	k" header field. This specification also introduces a link relation type to supp
	ort the discovery of sets of links.</t>
	</abstract>
	</front>
	<seriesInfo name="RFC" value="9264"/>
	<seriesInfo name="DOI" value="10.17487/RFC9264"/>
	</reference>
	<reference anchor="RFC7284">
	<front>
	<title>The Profile URI Registry</title>
	<author fullname="M. Lanthaler" initials="M." surname="Lanthaler"/>
	<date month="June" year="2014"/>
	<abstract>
	<t>This document defines a registry for profile URIs to be used in specifi
	cations standardizing profiles.</t>
	</abstract>
	</front>
	<seriesInfo name="RFC" value="7284"/>
	<seriesInfo name="DOI" value="10.17487/RFC7284"/>
	</reference>

	</references>


	<references title='Informative References' anchor="sec-informative-reference	<reference anchor="APIsjson" target="https://apisjson.org/format/apisjso
	s">	n_0.19.txt">
		<front>
		<title>API Discovery Format</title>
		<author initials="K" surname="Lane">
		<organization/>
		</author>
		<author initials="S" surname="Willmott">
		<organization/>
		</author>
		<date year="2024" month="November" day="6"/>
		</front>
		<annotation>Latest version available at <eref
		target="https://apisjson.org/"
		brackets="angle"/>.</annotation>
		</reference>


	<reference anchor="OAS" target="https://spec.openapis.org/oas/latest">	<!-- IESG State: Expired as of 02/05/25 -->
	<front>	<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.
	<title>OpenAPI Specification 3.1.0</title>	kelly-json-hal.xml"/>
	<author initials="" surname="Darrel Miller">
	<organization></organization>
	</author>
	<author initials="" surname="Jeremy Whitlock">
	<organization></organization>
	</author>
	<author initials="" surname="Marsh Gardiner">
	<organization></organization>
	</author>
	<author initials="" surname="Mike Ralphson">
	<organization></organization>
	</author>
	<author initials="" surname="Ron Ratovsky">
	<organization></organization>
	</author>
	<author initials="" surname="Uri Sarid">
	<organization></organization>
	</author>
	<date year="2021" month="February" day="15"/>
	</front>
	</reference>
	<reference anchor="APIsjson" target="http://apisjson.org/format/apisjson_0.16.tx
	t">
	<front>
	<title>APIs.json</title>
	<author initials="" surname="Kin Lane">
	<organization></organization>
	</author>
	<author initials="" surname="Steve Willmott">
	<organization></organization>
	</author>
	<date year="2020" month="September" day="15"/>
	</front>
	</reference>
	<reference anchor="HAL" target="https://datatracker.ietf.org/doc/html/draft-kell
	y-json-hal-11">
	<front>
	<title>JSON Hypertext Application Language</title>
	<author initials="" surname="Mike Kelly">
	<organization></organization>
	</author>
	<date year="2020" month="September" day="15"/>
	</front>
	</reference>
	<reference anchor="RESTdesc" target="http://apisjson.org/format/apisjson_0.16.tx
	t">
	<front>
	<title>RESTdesc</title>
	<author initials="" surname="Ruben Verborgh">
	<organization></organization>
	</author>
	<author initials="" surname="Erik Mannens">
	<organization></organization>
	</author>
	<author initials="" surname="Rick Van de Walle">
	<organization></organization>
	</author>
	<author initials="" surname="Thomas Steiner">
	<organization></organization>
	</author>
	<date year="2023" month="September" day="15"/>
	</front>
	</reference>
	<reference anchor="WebAPIext" target="https://webapi-discovery.github.io/rfcs/rf
	c0001.html">
	<front>
	<title>WebAPI type extension</title>
	<author initials="" surname="Mike Ralphson">
	<organization></organization>
	</author>
	<author initials="" surname="Nick Evans">
	<organization></organization>
	</author>
	<date year="2020" month="July" day="08"/>
	</front>
	</reference>


	<reference anchor="RFC8631">	<reference anchor="RESTdesc" target="https://restdesc.org/about/descript
	<front>	ions">
	<title>Link Relation Types for Web Services</title>	<front>
	<author fullname="E. Wilde" initials="E." surname="Wilde"/>	<title>RESTdesc</title>
	<date month="July" year="2019"/>	<author initials="R" surname="Verborgh">
	<abstract>	<organization/>
	<t>Many resources provided on the Web are part of sets of resources that a	</author>
	re provided in a context that is managed by one particular service provider. Oft	<author initials="E" surname="Mannens">
	en, these sets of resources are referred to as "Web services" or "Web APIs". Thi	<organization/>
	s specification defines link relations that represent relationships from Web ser	</author>
	vices or APIs to resources that provide documentation, descriptions, metadata, o	<author initials="R" surname="Van de Walle">
	r status information for these resources. Documentation is primarily intended fo	<organization/>
	r human consumers, whereas descriptions are primarily intended for automated con	</author>
	sumers. Metadata provides information about a service's context. This specificat	<author initials="T" surname="Steiner">
	ion also defines a link relation to identify status resources that are used to r	<organization/>
	epresent information about service status.</t>	</author>
	</abstract>	<date year="2025"/>
	</front>	</front>
	<seriesInfo name="RFC" value="8631"/>	</reference>
	<seriesInfo name="DOI" value="10.17487/RFC8631"/>
	</reference>


		<reference anchor="WebAPIext" target="https://webapi-discovery.github.io
		/rfcs/rfc0001.html">
		<front>
		<title>WADG0001 WebAPI type extension</title>
		<author initials="M" surname="Ralphson" role="editor">
		<organization/>
		</author>
		<author initials="N" surname="Evans" role="editor">
		<organization/>
		</author>
		<date year="2020" month="July" day="08"/>
		</front>
		<refcontent>Draft Community Group Report</refcontent>
		</reference>
		<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8
		631.xml"/>
		</references>
	</references>	</references>


	<?line 568?>	<section anchor="api-catalog-example-linkset">
		<name>Example API Catalog Documents</name>
	<section anchor="api-catalog-example-linkset"><name>Example API catalog document	<t>This section is informative and provides and example of an API
	s</name>

	<t>This section is informative and provides and example of an API
	catalog document using the Linkset format.</t>	catalog document using the Linkset format.</t>

		<section anchor="api-catalog-example-rfc8615">
	<section anchor="api-catalog-example-rfc8615"><name>Using Linkset with RFC8615 r	<name>Using Linkset with Link Relations Defined in RFC 8631</name>
	elations</name>	<t>This example uses the Linkset format <xref target="RFC9264"/> and the
		following
	<t>This example uses the Linkset format <xref target="RFC9264"/>, and the follow
	ing
	link relations defined in <xref target="RFC8631"/>:</t>	link relations defined in <xref target="RFC8631"/>:</t>

		<dl spacing="normal">
	<t><list style="symbols">	<dt>"service-desc":</dt><dd>Used to link to a description of the API that
	<t>"service-desc", used to link to a description of the API that is	is primarily intended for machine consumption (for example, the <xref
	primarily intended for machine consumption (for example the <xref target="OAS"><	target="OAS"/> specification, YAML, or JSON file).</dd>
	/xref>	<dt>"service-doc":</dt><dd>Used to link to API documentation that is
	specification YAML or JSON file).</t>	primarily
	<t>"service-doc", used to link to API documentation that is primarily
	intended for human consumption (an example of human-readable	intended for human consumption (an example of human-readable

	documentation is the IETF <eref target="https://datatracker.ietf.org/api/submiss	documentation is the IETF <eref target="https://datatracker.ietf.org/api/submiss
	ion">Internet-Draft submission API	ion" brackets="angle">Internet-Draft submission API
	instructions</eref>).</t>	instructions</eref>).</dd>
	<t>"service-meta", used to link to additional metadata about the API,	<dt>"service-meta":</dt><dd>Used to link to additional metadata abou
	and is primarily intended for machine consumption.</t>	t the API
	<t>"status", used to link to the API status (e.g. API "health"	and is primarily intended for machine consumption.</dd>
	indication etc.) for machine and/or human consumption.</t>	<dt>"status":</dt><dd>Used to link to the API status (e.g., API "hea
	</list></t>	lth"
		indication) for machine and/or human consumption.</dd>
	<t>Client request:</t>	</dl>
		<t>Client request:</t>
	<figure><sourcecode type="http-message"><![CDATA[	<sourcecode type="http-message"><![CDATA[
	GET .well-known/api-catalog HTTP/1.1	GET .well-known/api-catalog HTTP/1.1
	Host: example.com	Host: example.com
	Accept: application/linkset+json	Accept: application/linkset+json

	]]></sourcecode></figure>	]]></sourcecode>
		<t>Server response:</t>
	<t>Server response:</t>	<sourcecode type="http-message"><![CDATA[

	<figure><sourcecode type="http-message"><![CDATA[
	HTTP/1.1 200 OK	HTTP/1.1 200 OK
	Date: Mon, 01 Jun 2023 00:00:01 GMT	Date: Mon, 01 Jun 2023 00:00:01 GMT
	Server: Apache-Coyote/1.1	Server: Apache-Coyote/1.1
	Content-Type: application/linkset+json;	Content-Type: application/linkset+json;

	profile="THIS-RFC-URL"	profile="https://www.rfc-editor.org/info/rfc9727"
	]]></sourcecode></figure>	]]></sourcecode>
		<sourcecode type="ison"><![CDATA[
	<figure><artwork><![CDATA[
	{	{
	"linkset": [	"linkset": [
	{	{
	"anchor": "https://developer.example.com/apis/foo_api",	"anchor": "https://developer.example.com/apis/foo_api",
	"service-desc": [	"service-desc": [
	{	{
	"href": "https://developer.example.com/apis/foo_api/spec",	"href": "https://developer.example.com/apis/foo_api/spec",
	"type": "application/yaml"	"type": "application/yaml"
	}	}
	],	],

	skipping to change at line 915 ¶	skipping to change at line 766 ¶
	],	],
	"service-doc": [	"service-doc": [
	{	{
	"href": "https://apis.example.net/apis/cantona_api/doc",	"href": "https://apis.example.net/apis/cantona_api/doc",
	"type": "text/html"	"type": "text/html"
	}	}
	]	]
	}	}
	]	]
	}	}

	]]></artwork></figure>	]]></sourcecode>
		</section>
	</section>	<section anchor="api-catalog-example-linkset-bookmarks">
	<section anchor="api-catalog-example-linkset-bookmarks"><name>Using Linkset with	<name>Using Linkset with Bookmarks</name>
	bookmarks</name>	<t>This example also uses the Linkset format <xref target="RFC9264"/> an
		d lists the
	<t>This example also uses the Linkset format <xref target="RFC9264"/>, listing t
	he
	API endpoints in an array of bookmarks. Each link shares the same	API endpoints in an array of bookmarks. Each link shares the same
	context anchor (the well-known URI of the API catalog) and "item"	context anchor (the well-known URI of the API catalog) and "item"
	<xref target="RFC9264"/> link relation (to indicate they are an item in the	<xref target="RFC9264"/> link relation (to indicate they are an item in the
	catalog). The intent is that by following a bookmark link, a	catalog). The intent is that by following a bookmark link, a

	machine-client can discover the purpose and usage policy for each	machine client can discover the purpose and usage policy for each
	API, hence the document targeted by the bookmark link should support	API; hence, the document targeted by the bookmark link should support
	this.</t>	this.</t>

		<t>Client request:</t>
	<t>Client request:</t>	<sourcecode type="http-message"><![CDATA[

	<figure><sourcecode type="http-message"><![CDATA[
	GET .well-known/api-catalog HTTP/1.1	GET .well-known/api-catalog HTTP/1.1
	Host: example.com	Host: example.com
	Accept: application/linkset+json	Accept: application/linkset+json

	]]></sourcecode></figure>	]]></sourcecode>
		<t>Server response:</t>
	<t>Server response:</t>	<sourcecode type="http-message"><![CDATA[

	<figure><sourcecode type="http-message"><![CDATA[
	HTTP/1.1 200 OK	HTTP/1.1 200 OK
	Date: Mon, 01 Jun 2023 00:00:01 GMT	Date: Mon, 01 Jun 2023 00:00:01 GMT
	Server: Apache-Coyote/1.1	Server: Apache-Coyote/1.1
	Content-Type: application/linkset+json;	Content-Type: application/linkset+json;

	profile="THIS-RFC-URL"	profile="https://www.rfc-editor.org/info/rfc9727"
	]]></sourcecode></figure>	]]></sourcecode>
		<sourcecode type="json"><![CDATA[
	<figure><artwork><![CDATA[
	{ "linkset":	{ "linkset":
	[	[
	{ "anchor": "https://www.example.com/.well-known/api-catalog",	{ "anchor": "https://www.example.com/.well-known/api-catalog",
	"item": [	"item": [
	{"href": "https://developer.example.com/apis/foo_api"},	{"href": "https://developer.example.com/apis/foo_api"},
	{"href": "https://developer.example.com/apis/bar_api"},	{"href": "https://developer.example.com/apis/bar_api"},
	{"href": "https://developer.example.com/apis/cantona_api"}	{"href": "https://developer.example.com/apis/cantona_api"}
	]	]
	}	}
	]	]
	}	}

	]]></artwork></figure>	]]></sourcecode>
		</section>
	</section>	<section anchor="api-catalog-other-formats">
	<section anchor="api-catalog-other-formats"><name>Other API catalog formats</nam	<name>Other API Catalog Formats</name>
	e>	<t>A non-exhaustive list of other API catalog document formats includes:
		</t>
	<t>A non-exhaustive list of other API catalog document formats includes:</t>	<ul spacing="normal">
		<li>
	<t><list style="symbols">	<t>An APIs.json document <xref target="APIsjson"/>.</t>
	<t>An APIs.json document <xref target="APIsjson"></xref>.</t>	</li>
	<t>A RESTDesc semantic description for hypermedia APIs <xref target="RESTdesc"	<li>
	></xref>.</t>	<t>A RESTDesc semantic description for hypermedia APIs <xref target=
	<t>A Hypertext Application Language document <xref target="HAL"></xref>.</t>	"RESTdesc"/>.</t>
	<t>An extension to the Schema.org WebAPI type <xref target="WebAPIext"></xref>	</li>
	.</t>	<li>
	</list></t>	<t>A Hypertext Application Language document <xref target="I-D.kelly
		-json-hal"/>.</t>
	</section>	</li>
	<section anchor="api-catalog-example-linkset-nesting"><name>Nesting API catalog	<li>
	links</name>	<t>An extension to the Schema.org WebAPI type <xref target="WebAPIex
		t"/>.</t>
	<t>In this example, a request to the /.well-known/api-catalog URI	</li>
	returns an array of links of relation type 'api-catalog'. This can be	</ul>
	useful to Publishers with a large number of APIs, who wish to group	</section>
		<section anchor="api-catalog-example-linkset-nesting">
		<name>Nesting API Catalog Links</name>
		<t>In this example, a request to the /.well-known/api-catalog URI
		returns an array of links of relation type "api-catalog". This can be
		useful to Publishers with a large number of APIs who wish to group
	them in smaller catalogs (as described in <xref target="scalability"/>).</t>	them in smaller catalogs (as described in <xref target="scalability"/>).</t>

		<t>Client request:</t>
	<t>Client request:</t>	<sourcecode type="http-message"><![CDATA[

	<figure><sourcecode type="http-message"><![CDATA[
	GET .well-known/api-catalog HTTP/1.1	GET .well-known/api-catalog HTTP/1.1
	Host: example.com	Host: example.com
	Accept: application/linkset+json	Accept: application/linkset+json

	]]></sourcecode></figure>	]]></sourcecode>
		<t>Server response:</t>
	<t>Server response:</t>	<sourcecode type="http-message"><![CDATA[

	<figure><sourcecode type="http-message"><![CDATA[
	HTTP/1.1 200 OK	HTTP/1.1 200 OK
	Date: Mon, 01 Jun 2023 00:00:01 GMT	Date: Mon, 01 Jun 2023 00:00:01 GMT
	Server: Apache-Coyote/1.1	Server: Apache-Coyote/1.1
	Content-Type: application/linkset+json;	Content-Type: application/linkset+json;

	profile="THIS-RFC-URL"	profile="https://www.rfc-editor.org/info/rfc9727"
	]]></sourcecode></figure>	]]></sourcecode>
		<sourcecode type="json"><![CDATA[
	<figure><artwork><![CDATA[
	{	{
	"linkset": [	"linkset": [
	{	{
	"anchor": "https://www.example.com/.well-known/api-catalog",	"anchor": "https://www.example.com/.well-known/api-catalog",
	"api-catalog": [	"api-catalog": [
	{	{
	"href": "https://apis.example.com/iot/api-catalog"	"href": "https://apis.example.com/iot/api-catalog"
	},	},
	{	{
	"href": "https://ecommerce.example.com/api-catalog"	"href": "https://ecommerce.example.com/api-catalog"
	},	},
	{	{
	"href": "https://developer.example.com/gaming/api-catalog"	"href": "https://developer.example.com/gaming/api-catalog"
	}	}
	]	]
	}	}
	]	]
	}	}

		]]></sourcecode>
	]]></artwork></figure>	</section>
		</section>
	</section>	<section anchor="acknowledgements" numbered="false">
	</section>	<name>Acknowledgements</name>
	<section anchor="acknowledgements"><name>Acknowledgements</name>	<t>Thanks to <contact fullname="Jan Algermissen"/>, <contact
		fullname="Phil Archer"/>, <contact fullname="Tim Bray"/>, <contact
	<t>Thanks to Jan Algermissen, Phil Archer, Tim Bray, Ben Bucksch, Sanjay	fullname="Ben Bucksch"/>, <contact fullname="Sanjay Dalal"/>, <contact
	Dalal, David Dong, Erik Kline, Mallory Knodel, Murray Kucherawy, Max	fullname="David Dong"/>, <contact fullname="Erik Kline"/>, <contact
	Maton, Darrel Miller, Mark Nottingham, Roberto Polli, Joey Salazar,	fullname="Mallory Knodel"/>, <contact fullname="Murray Kucherawy"/>,
	Rich Salz, Herbert Van De Sompel, Orie Steele, Tina Tsou,	<contact fullname="Max Maton"/>, <contact fullname="Darrel Miller"/>,
	Gunter Van Der Velde, Eric Vyncke, and Erik Wilde for their reviews,	<contact fullname="Mark Nottingham"/>, <contact fullname="Roberto
	suggestions and support.</t>	Polli"/>, <contact fullname="Joey Salazar"/>, <contact fullname="Rich
		Salz"/>, <contact fullname="Herbert Van De Sompel"/>, <contact
	</section>	fullname="Orie Steele"/>, <contact fullname="Tina Tsou"/>, <contact
		fullname="Gunter Van de Velde"/>, <contact fullname="Éric Vyncke"/>,
		and <contact fullname="Erik Wilde"/> for their reviews, suggestions, and
		support.</t>
		</section>
	</back>	</back>


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