XEP-0121: Dublin Core Infobits Mapping

1. Introduction¶

Infobits (XEP-0120) [1] defines a protocol for capturing granular information (or "infobits") about users, servers, services, rooms, nodes, commands, files, and other phenomena on the Jabber/XMPP network; however, that document defines the protocol only, not the infobits themselves. This document specifies how to encapsulate one sort of metadata in infobits: the common metadata elements defined by the Dublin Core Metadata Initiative (DCMI) [2]. Note well that this document is decidedly not meant to provide an exhaustive catalog of possible infobits. Future registrations, whether in XMPP Extension Protocol specifications or direct submissions to the XMPP Registrar [3], will specify additional infobits.

2. Dublin Core Metadata Terms¶

The Dublin Core Metadata Initiative defines a number of common elements and element refinements that can be used to specify metadata about entities (especially but not exclusively publications). The semantics of any Dublin Core term can be represented as a Jabber infobit, where the infobit keyname consists of the term name (not label) prepended by a 'DC' prefix and a '.' separator character. Thus "DC.creator" is a valid infobit name and can be used to describe, for example, an IM user's relationship to the URI identifying the user's homepage or weblog. Infobit keynames beginning with the 'DC' prefix are reserved for DCMI Metadata Terms [4] only (the canonical list of these terms is available from the Dublin Core Metadata Initiative and is included here only for explanatory purposes).

3. Examples¶

The following example is borrowed from User Tune (XEP-0118) [5].

<iq type='set'
    from='stpeter@jabber.org/work'
    to='pubsub.jabber.org'
    id='tunes123'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
    <publish node='generic/tunes/stpeter@jabber.org'>
      <item id='current'>
        <tune xmlns='http://jabber.org/protocol/tunes'>
          <info xmlns='http://jabber.org/protocol/infobits'>
            <bit key='DC.creator'>Yes</bit>
            <bit key='DC.title'>Heart of the Sunrise</bit>
            <bit key='DC.source'>Yessongs</bit>
            <bit key='DC.identifier'>3</bit>
            <bit key='DC.extent'>P11M26S</bit>
          </info>
        </tune>
      </item>
    </publish>
  </pubsub>
</iq>

The following is an example of metadata for a conference room.

<iq type='result'
    from='jdev@conference.jabber.org'
    id='mdata'>
  <query xmlns='http://jabber.org/protocol/disco#info'
         node='metadata'>
    <info xmlns='http://jabber.org/protocol/infobits'>
      <bit key='DC.title'>jdev: Jabber Development</bit>
      <bit key='DC.description'>Discussion room for Jabber developers</bit>
      <bit key='DC.subject'>Jabber</bit>
      <bit key='DC.subject'>XMPP</bit>
    </info>
  </query>
</iq>

4. Security Considerations¶

This document introduces no security considerations above and beyond those already defined in XEP-0120.

5. IANA Considerations¶

This document requires no interaction with the Internet Assigned Numbers Authority (IANA) [6].

6. XMPP Registrar Considerations¶

The following is a submission to the infobits registry called for by XEP-0120.

<bit key='DC.title'/>
<bit key='DC.creator'/>
<bit key='DC.subject'/>
<bit key='DC.description'/>
<bit key='DC.publisher'/>
<bit key='DC.contributor'/>
<bit key='DC.date'/>
<bit key='DC.type'/>
<bit key='DC.format'/>
<bit key='DC.identifier'/>
<bit key='DC.source'/>
<bit key='DC.language'/>
<bit key='DC.relation'/>
<bit key='DC.coverage'/>
<bit key='DC.rights'/>
<bit key='DC.audience'/>
<bit key='DC.alternative'/>
<bit key='DC.tableOfContent'/>
<bit key='DC.abstract'/>
<bit key='DC.created'/>
<bit key='DC.valid'/>
<bit key='DC.available'/>
<bit key='DC.issued'/>
<bit key='DC.modified'/>
<bit key='DC.extent'/>
<bit key='DC.medium'/>
<bit key='DC.isVersionOf'/>
<bit key='DC.hasVersion'/>
<bit key='DC.isReplacedBy'/>
<bit key='DC.replaces'/>
<bit key='DC.isRequiredBy'/>
<bit key='DC.requires'/>
<bit key='DC.isPartOf'/>
<bit key='DC.hasPart'/>
<bit key='DC.isReferencedBy'/>
<bit key='DC.references'/>
<bit key='DC.isFormatOf'/>
<bit key='DC.hasFormat'/>
<bit key='DC.conformsTo'/>
<bit key='DC.spatial'/>
<bit key='DC.temporal'/>
<bit key='DC.mediator'/>
<bit key='DC.dateAccepted'/>
<bit key='DC.dateCopyrighted'/>
<bit key='DC.dateSubmitted'/>
<bit key='DC.educationLevel'/>
<bit key='DC.accessRights'/>
<bit key='DC.bibliographicCitation'/>
<bit key='DC.LCSH'/>
<bit key='DC.MESH'/>
<bit key='DC.DDC'/>
<bit key='DC.LCC'/>
<bit key='DC.UDC'/>
<bit key='DC.DCMIType'/>
<bit key='DC.IMT'/>
<bit key='DC.ISO639-2'/>
<bit key='DC.RFC1766'/>
<bit key='DC.URI'/>
<bit key='DC.Point'/>
<bit key='DC.ISO3166'/>
<bit key='DC.Box'/>
<bit key='DC.TGN'/>
<bit key='DC.Period'/>
<bit key='DC.W3CDTF'/>
<bit key='DC.RFC3066'/>
<bit key='DC.Collection'/>
<bit key='DC.Dataset'/>
<bit key='DC.Event'/>
<bit key='DC.Image'/>
<bit key='DC.InteractiveResource'/>
<bit key='DC.Service'/>
<bit key='DC.Software'/>
<bit key='DC.Sound'/>
<bit key='DC.Text'/>
<bit key='DC.PhysicalObject'/>
<bit key='DC.StillImage'/>
<bit key='DC.MovingImage'/>

Appendices

Appendix A: Document Information¶

Series

XEP

Number

0121

Publisher

XMPP Standards Foundation

Status

Retracted

Type

Informational

Version

0.6

Last Updated

2003-12-15

Approving Body

XMPP Council

Dependencies

XEP-0120

Supersedes

None

Superseded By

None

Short Name

N/A

Source Control

HTML

This document in other formats: XML  PDF

Appendix B: Author Information¶

Peter Saint-Andre

Email

stpeter@stpeter.im

JabberID

stpeter@jabber.org

URI

https://stpeter.im/

Appendix C: Legal Notices¶

Appendix D: Relation to XMPP¶

The Extensible Messaging and Presence Protocol (XMPP) is defined in the XMPP Core (RFC 6120) and XMPP IM (RFC 6121) specifications contributed by the XMPP Standards Foundation to the Internet Standards Process, which is managed by the Internet Engineering Task Force in accordance with RFC 2026. Any protocol defined in this document has been developed outside the Internet Standards Process and is to be understood as an extension to XMPP rather than as an evolution, development, or modification of XMPP itself.

Appendix E: Discussion Venue¶

The primary venue for discussion of XMPP Extension Protocols is the <standards@xmpp.org> discussion list.

Discussion on other xmpp.org discussion lists might also be appropriate; see <https://xmpp.org/community/> for a complete list.

Errata can be sent to <editor@xmpp.org>.

Appendix F: Requirements Conformance¶

The following requirements keywords as used in this document are to be interpreted as described in RFC 2119: "MUST", "SHALL", "REQUIRED"; "MUST NOT", "SHALL NOT"; "SHOULD", "RECOMMENDED"; "SHOULD NOT", "NOT RECOMMENDED"; "MAY", "OPTIONAL".

Appendix G: Notes¶

Appendix H: Revision History¶

Note: Older versions of this specification might be available at https://xmpp.org/extensions/attic/

1. Version 0.6 (2003-12-15)¶
   Confined proposal to Dublin Core only.
   psa
2. Version 0.5 (2003-12-14)¶
   Added more vCard mappings; specified prefixes for some infobits; defined registry submission.
   psa
3. Version 0.4 (2003-10-23)¶
   Modified Dublin Core references.
   psa
4. Version 0.3 (2003-10-22)¶
   Updated to track changes in XEP-0120.
   psa
5. Version 0.2 (2003-09-28)¶
   Added several new info keys; further defined Dublin Core metadata elements; added internationalization considerations.
   psa
6. Version 0.1 (2003-09-23)¶
   Initial version.
   psa

Appendix I: Bib(La)TeX Entry

@report{saint-andre2003n/a,
  title = {Dublin Core Infobits Mapping},
  author = {Saint-Andre, Peter},
  type = {XEP},
  number = {0121},
  version = {0.6},
  institution = {XMPP Standards Foundation},
  url = {https://xmpp.org/extensions/xep-0121.html},
  date = {2003-09-23/2003-12-15},
}

END