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inbox/pubsub-uri.xml
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inbox/pubsub-uri.xml
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE xep SYSTEM "xep.dtd" [
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<!ENTITY SELF "XEP-xxxx">
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<!ENTITY % ents SYSTEM "xep.ent">
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%ents;
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<!ENTITY ABNF "<span class='ref'><link url='http://tools.ietf.org/html/rfc5234'>ABNF</link></span> <note>RFC 5234: Augmented BNF for Syntax Specifications: ABNF <<link url='http://tools.ietf.org/html/rfc5234'>http://tools.ietf.org/html/rfc5234</link>>.</note>" >
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<!ENTITY UTF-8 "<span class='ref'><link url='http://tools.ietf.org/html/rfc3629'>UTF-8</link></span> <note>RFC 3629: UTF-8, a transformation format of ISO 10646 <<link url='http://tools.ietf.org/html/rfc3629'>http://tools.ietf.org/html/rfc3629</link>>.</note>" >
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]>
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<?xml-stylesheet type="text/xsl" href="xep.xsl"?>
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<xep>
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<header>
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<title>The 'xmpp.pubsub' URI Scheme</title>
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<abstract>This document defines the format of Uniform Resource Identifiers
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(URIs) to identify nodes in the context of Publish-Subscribe services as
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well as items within the scope of such nodes.</abstract>
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&LEGALNOTICE;
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<number>xxxx</number>
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<status>ProtoXEP</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0060</spec>
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<spec>RFC 3986</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>NOT_YET_ASSIGNED</shortname>
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<author>
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<firstname>Klaus</firstname>
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<surname>Hartke</surname>
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<email>hartke@tzi.org</email>
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<jid>nx@jabber.org</jid>
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</author>
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<revision>
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<version>0.0.1</version>
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<date>2012-01-14</date>
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<initials>kh</initials>
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<remark>
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<p>Initial draft.</p>
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</remark>
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</revision>
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</header>
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<section1 topic="Introduction" anchor="intro">
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<p>&xep0060; is an XMPP protocol extension for generic publish-subscribe
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functionality. Several protocols use Uniform Resource Identifiers (URIs) to
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refer to data. By defining a URI scheme for pubsub data, the gap between
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these two worlds is bridged. The 'xmpp.pubsub' URI scheme defined here can
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be used to reference any node within the context of a specific pubsub
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service, or an item within the scope of a specific node.</p>
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<p class="box">Note: <cite>XEP-0060</cite>, Section 4.6.1, specifies the
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use of JIDs for addressing pubsub nodes, which in combination with the
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&xmppiri; already provides a way to generate URIs for these nodes. This,
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however, does not allow addressing nodes that are addressable as a JID plus
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node (see <cite>XEP-0060</cite>, Section 4.6.2), and also does not allow
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referring to the items published to nodes.</p>
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</section1>
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<section1 topic="Requirements" anchor="reqs">
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<p>The URI scheme defined herein is designed to meet the following
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requirements:</p>
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<ol>
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<li>Provide a way to address pubsub items and nodes.</li>
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<li>Address pubsub nodes as JID plus NodeID.</li>
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<li>Enable applications to fabricate a URI given a JID and a NodeID.
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</li>
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<li>Support relative URI references.</li>
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</ol>
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</section1>
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<section1 topic="Syntax" anchor="syntax">
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<p>The URI scheme follows the generic syntax from &rfc3986; and is
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described using &ABNF;. The "host", "query", "gen-delims", "sub-delims",
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"pct-encoded", "reserved" and "unreserved" rules are defined in
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<cite>RFC 3986</cite>, and the "authxmpp" and "nodeid" rule are
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defined in <cite>RFC 5122</cite>.</p>
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<code>
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<![CDATA[
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xmpp-pubsub-URI = "xmpp.pubsub:" [ "//" authxmpp "/" ] pubsub-path [ "?" query ]
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pubsub-path = [ nodeid "@" ] host [ "/" [ pubsub-nodeid [ "/" [ pubsub-itemid ] ] ] ]
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pubsub-nodeid = 1*( unreserved / pct-encoded / sub-delims )
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pubsub-itemid = 1*( unreserved / pct-encoded / sub-delims )
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]]>
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</code>
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<p>Unless specified in the URI, the authority ("authxmpp") is assumed to be
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locally known, and the NodeID ("pubsub-nodeid") to refer to the root node
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(i.e., the service itself).</p>
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<p>A number of characters that can appear in an NodeID and ItemID MUST be
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percent-encoded in pubsub-nodeid and pubsub-itemid respectively. These are
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the characters that cannot appear in a URI according to <cite>RFC
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3986</cite> as well as "%" (because it is used for percent-encoding) and
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all the characters in the "gen-delims" set (i.e., ":", "/", "?", "#", "[",
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"]" and "@").</p>
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<p>Note that this specification, like any URI scheme specification, does
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not define syntax or meaning of a fragment identifier (see <cite>RFC
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3986</cite>, Section 3.5), because these depend on the type of a retrieved
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representation. The character "#" in pubsub-nodeid's and pubsub-itemid's
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MUST be escaped as %23.</p>
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<p>Since the scheme conforms to the URI generic syntax; URIs of this scheme
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are normalized and compared according to the algorithm defined in <cite>RFC
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3986</cite>, Section 6.</p>
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<p>The scheme and host are case-insensitive and normally provided in
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lowercase; all other components are compared in a case-sensitive manner.
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Characters other than those in the "reserved" set are equivalent to their
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percent-encoded octets (see <cite>RFC 3986</cite>, Section 2.1): the normal
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form is to not encode them.
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Non-ASCII characters can be encoded according to &UTF-8;, and then each
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octet of the corresponding UTF-8 sequence is percent-encoded to be
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represented as URI characters.</p>
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<p>If no NodeID and no ItemID is specified, the slash character after host
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is OPTIONAL. Likewise, if a NodeID but no ItemID is specified, the slash
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character after pubsub-nodeid is OPTIONAL. The normal form is to provide
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the slash character in either case.</p>
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</section1>
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<section1 topic="Semantics" anchor="semantics">
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<p>An 'xmpp.pubsub' URI designates a node within the context of a specific
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pubsub service, or an item within the scope of a node.
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A publish-subscribe service is an XMPP server or component that adheres
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to the protocol defined in <cite>XEP-0060</cite>.
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A node is a location to which information can be published and from which
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event notifications and/or payloads can be received. Nodes are uniquely
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identified by a NodeID within the context of a particular pubsub service.
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An item is an XML fragment which is published to a node, thereby generating
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an event. Items are uniquely identified by an ItemID within the scope of a
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node.</p>
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<p>An application that processes an 'xmpp.pubsub' URI reconstructs the
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encapsulated XMPP address, NodeID and optionally ItemID, connects to an
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appropriate XMPP server, and sends an appropriate XMPP "stanza" (XML
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fragment) with the NodeID and ItemID to the XMPP address.
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The set of possible operations is defined in <cite>XEP-0060</cite>.</p>
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<p>The query component provides a way to refer more specifically to
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data associated with the target. Possible values for URIs referring to
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nodes are: "meta-data" and "last-item".</p>
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<p>If an authority ("authxmpp") is given in the URI string, this indicates
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the user the application should connect as. Otherwise, the application
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should connect as the default user.</p>
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</section1>
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<section1 topic="Examples" anchor="examples">
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<example caption="A URI referring to a root node">
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<![CDATA[xmpp.pubsub:pubsub.shakespeare.lit/]]>
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</example>
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<example caption="A URI referring to a node">
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<![CDATA[xmpp.pubsub:pubsub.shakespeare.lit/princely_musings/]]>
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</example>
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<example caption="A URI referring to the meta-data of a node">
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<![CDATA[xmpp.pubsub:pubsub.shakespeare.lit/princely_musings/?meta-data]]>
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</example>
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<example caption="A URI referring to the last published item of a node">
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<![CDATA[xmpp.pubsub:pubsub.shakespeare.lit/princely_musings/?last-item]]>
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</example>
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<example caption="A URI referring to an item">
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<![CDATA[xmpp.pubsub:pubsub.shakespeare.lit/princely_musings/ae890ac52d0df67ed7cfdf51b644e901]]>
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</example>
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</section1>
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<section1 topic="Security Considerations" anchor="security">
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<p>TODO.</p>
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</section1>
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<section1 topic="IANA Considerations" anchor="iana">
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<p>This document requests the registration of the Uniform Resource
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Identifier (URI) scheme 'xmpp.pubsub' with &IANA;. The registration
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request complies with &rfc4395;.</p>
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<dl>
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<di>
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<dt>URI scheme name.</dt>
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<dd>xmpp.pubsub</dd>
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</di>
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<di>
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<dt>Status.</dt>
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<dd>Permanent</dd>
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</di>
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<di>
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<dt>URI scheme syntax.</dt>
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<dd>See the syntax section of &SELF;.</dd>
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</di>
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<di>
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<dt>URI scheme semantics.</dt>
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<dd>See the semantics section of &SELF;.</dd>
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</di>
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<di>
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<dt>Encoding considerations.</dt>
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<dd>See the syntax section of &SELF;.</dd>
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</di>
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<di>
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<dt>Applications/protocols that use this URI scheme name.</dt>
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<dd>The 'xmpp.pubsub' URI scheme is intended to be used by interfaces
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to an XMPP network that wish to interact with XMPP pubsub services
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and need to identify pubsub nodes within the context of these services
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as well as items in the scope of these nodes.</dd>
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</di>
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<di>
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<dt>Interoperability considerations.</dt>
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<dd>None.</dd>
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</di>
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<di>
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<dt>Security considerations.</dt>
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<dd>See the security considerations section of &SELF;.</dd>
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</di>
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<di>
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<dt>Contact.</dt>
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<dd>XSF</dd>
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</di>
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<di>
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<dt>Author/Change controller.</dt>
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<dd>XSF</dd>
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</di>
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<di>
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<dt>References.</dt>
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<dd>&SELF;</dd>
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</di>
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</dl>
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</section1>
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<section1 topic="XMPP Registrar Considerations" anchor="registrar">
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<p>No namespaces or parameters need to be registered with the ®ISTRAR;
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as a result of this document.</p>
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</section1>
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<section1 topic="Acknowledgements" anchor="acknowledgements">
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<p>Some text in this document was borrowed or adapted from <cite>RFC
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3986</cite>, <cite>RFC 5122</cite> and <cite>XEP-0060</cite>.</p>
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<p>This work was funded by Intel.</p>
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</section1>
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</xep>
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