DCMI Architecture Working Group

Title: DCMI Architecture Working Group
Chair: Daniel Brickley, danbri@w3.org
Chair: Sigfrid Lundberg, sigfrid.lundberg@lub.lu.se
Status: This working group is currently active.
Established: 2000-10-06

The DCMI Architecture WG continues and draws together the work of the Datamodel, Schema working groups and the Implementor special intrest group. With the ratification of an initial set of exemplary Dublin Core qualifiers by the DCMI Usage Committee, there is a need to provide clear, principled and consistent guidelines for deploying Dublin Core metadata applications.

The objectives of the working group are to discuss and develop a model, strategy and roadmap for the practical deployment of Dublin Core metadata using mainstream Web technologies (XML/RDF/HTML).

and Announcements

2001-01-16, The DCMI Directorate is pleased to announce that An XML Encoding of Simple Dublin Core Metadata has reached Proposed Recommendation status.

Jump to: Milestones/Deliverables | Open Issues | Forums | Background | mail archives | History | Related Work | Resources

Milestones/Deliverables [top]

Note: lead editors/authors/volunteers are listed below. In addition to document creation, the DC Architecture group involves a number of metadata implementors. This page will track DC Architecture implementations, which will be used to evaluate the maturity of our specifications.

Scheduled Milestone Description Editor/Contact Status/History
DCArchTasklist DCMI Architecture tasklist, enumerating works in progress and associated timescales WG chairs Completed
DCSimpleSchema Dublin Core Metadata Elements (unqualified) in RDF-compliant XML DTD [ proposed recommendation] Dave Beckett (lead author). Completed to PR
The document authors consider the work (as of Dec 2000) finished, and a candidate for implementation testing and feedback.
Next steps:
  • stable DTD URI needed for deployment testing
  • Announcement of PR and call for implemention expected
DCGuideExamples The DC Guide contains RDF examples; these should be kept consistent with current dc-architecture designs.
Raised: Weibel 2001-02-20
Architecture and Guide chairs Proposed resolution: userguide-eg1.rdf from Dan Brickley (see also RDFViz.org GIF diagram)
Next steps:
ArchRoadmap DCMI Architecture / roadmap document   Note: this draft deliverable has removed from tasklist. The 'roadmap' for DC Architecture should be evident from this page and from published specifications and guides.
DCRDFModel Guidelines on RDF Model representation of Qualified Dublin Core (revision of existing doc) [ working draft]. Roland Schwaenzl, Dave Beckett, Dan Brickley In Progress

See DCRDFQual redraft works in progress, a draft for review to the WG planned for end March 2001. This deliverable will need to address the topic of "structured values".

Works in Progress:

DCQualSchema An RDF-compliant XML DTD/Schema for Qualified Dublin Core (volunteered: Dan Brickley, Dave Beckett) In progress; dependent on RDF-Model for DC in RDF/XML
DCQualHTMLMETA Dublin Core Qualifiers (HTML encoded META) [working draft] Simon Cox; Andy Powell; Eric Miller Completed
DCQualNatLang Discussion document: a natural language expression for qualified Dublin Core metadata sentences. Tom Baker Completed (Published as D-Lib Magazine article
DCMI Namespace Policy A namespace policy statement [working draft] Stu Weibel In Progress


Open Issues [top]

A list of as yet unresolved issues, or those ideas or problems that are still under discussion.


Forums [top]

Decisions are made by obtaining a consensus from a broad range of individuals and organizations. Listed here are some of the places where discussions take place:

Working Group mailing list: http://www.jiscmail.ac.uk/lists/dc-architecture.html

Background [top]

Information on discussions and decisions that were used to support the creation of this working group.

This working group addresses two requirements commonly articulated by metadata implementors in the Dublin Core community. Firstly, there is a need for simple, short and practical specifications describing Dublin Core deployment strategies using HTML, XML and RDF. Secondly, there is a need for architectural consistency across these complementary specifications, and some broad 'overview' or roadmap materials providing a readily comprehended view of how these various activities fit together.

The Architecture WG is in particular expected to address the need for an RDF-compatible approach to DC deployment that interacts well with mainstream Web technologies such as HTML and XML.

Regarding HTML, the WG should build upon the qualified DC using HTML meta draft, the additional possibilities provided by the recent W3C XHTML 1.0 Recommendation, and the transformational capabilities of Extenstible Stylesheet Language (XSL). The use of XSLT for transforming between XML-based data formats provides a number of strategies that the DCMI Architecture WG will need to explore. XSLT can, for example, be used to transform various XML dialects (eg. XHTML, or data written to proprietary DTDs) into formats more suited to interchange or aggregation (further reading: danc-0101, danc-0026).

The goal of the WG is to provide enabling technology to support the deployment of rich metadata modeling and description based on existing specifications from DCMI, W3C and elsewhere. WG members will therefore need some understanding both of various relevant technologies (XML,RDF,HTML,XHTML,XSLT...) and of the kinds metadata applications Dublin Core and RDF are being applied to.

It is not a goal of this WG to undertake any actual data modelling work, ie. we do not aim to redescribe the entities and relationships described in Dublin Core (and related) metadata structures. Rather, we are attempting to articulate deployment strategies that allow such data modeling activites to be conducted in a more decentralised fashion. The recent simplification of the DCMI's approach to qualifiers is indicative of a broader shift towards a model in which the DCMI Usage Committee plays the role of endorser rather than creator with respect to new metadata vocabulary elements. The central challenge addressed by the Architecture WG is to specify practically implementable mechanisms by which (qualified) Dublin Core data structures can be deployed, and presented as candidates for endorsement by the Usage Committee. These mechanisms will need to embrace not just the exemplary DC qualifiers recently ratified, but other such qualifiers specified according to the principles adopted by the DCMI Usage Committee.

History [top]

Information on when this working group was constituted, dates of group meetings and results from those meetings, etc.

Related Work [top]

Links to groups, reports, software, projects, etc. that would be of interest to the participants of this working group.

The RDF Interest Group provides an active forum for discussion amongst RDF/XML metadata implementors.

The open metadata registry testbed contains links to draft rdf schema for many Dublin Core qualifier constructs.

Resources [top]

Information, standards and reports that were used to support the decisions and discussions in this working group.

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Metadata associated with this resource: http://dublincore.org/groups/architecture/index.shtml.rdf