Revised DCAM and DC-RDF available
Before the intervention of the Easter holiday weekend and my return to a pile of Eduserv Research Grant proposals to review, I had intended to post a quick note to say that DCMI has made new versions of the DCMI Abstract Model and Expressing Dublin Core Metadata using RDF available for public comment. The main changes in this version of the DCAM reflect the requirement which emerged from discussion of the previous version to distinguish unambiguously between literal and non-literal values. Those changes have added some complexity to the description set model, but I think the consequence is that the mapping to RDF graphs described in the second document is now much clearer. Anyway, comments welcome - to the dc-architecture mailing list rather than here though, please.
My next job on that front is to try to remember where we had got to six months ago and draft a new version of the DC-XML format (or formats) reflecting the updates to the DCAM. A few recent(-ish) items (sort of) in this space:
- The W3C GRDDL Working Group has published a number of documents, including a last call working draft of the GRDDL specification, a note describing some use cases, and the first public draft of some test cases. I'm very excited by GRDDL, I must admit. The idea is very simple - provide some mechanisms for indicating that an XML document contains data compatible with RDF and for linking to algorithms to extract (the "G" is for "gleaning") that data - but very elegant, and it has enormous potential value for making data represented in various XML formats or "microformats" part of the Semantic Web, with no additional effort on the part of the document author.
- An interesting conversation about the role of validation in XML: "Validity should be treated not as a property of a document but as a relationship between a document and a schema." (James Clark).
- The W3C Technical Architecture Group has - mainly in response to the work on CURIEs done by the RDF-in-HTML Task Force - opened a new TAG issue on the abbreviation of URIs.
I'm off to Manchester on Monday to talk about the DCAM to a meeting of the JISC CETIS Metadata and Digital Repositories Special Interest Group. I'll put some slides on Slideshare, err, when I finish them....