Don’t call me DOM

19 May 2005

GRDDL specification updated works with Microformats

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The GRDDL specification was updated with a new version last Monday. While there was quite a bit of editorial work (mainly the work of DanC), there were two really impotant changes:

  • the document is now a Team Submission rather than a Coordination Group Note; this was the shortest way to update the specification, given that no Working Group has clearly manifested an interest in maintaining the document at this time (see the related discussion) , but this is not necessarily the final status of the specification
  • using GRDDL as a way to describe a specific HTML profile has been officially added to the specification

This last change, while it had floated in a few implementations for quite some time (e.g. in the XSLT-based demonstrators), is probably one of the most interesting capabilities for the HTML community, and especially for the HTML Microformats. Basically, it means that a GRDDL processor when encountering an HTML document with a profile attribute set to a given URI (as for instance in XFN) will get to that URI, tries to GRDDL it (so that the profile document can be in any XML language), and if it finds the appropriate description, it will apply the XSLT transformation found to the initial document.

To take a practical example with the XFN microformat, since this microformat uses a well-defined profile, if the community is interested to make all the XFN content incorporated in the Semantic Web, they just need to update the said profile to point to a relevant XSLT transformation (DanC drafted one a while ago) and any GRDDL-enabled processor would be able to parse the data.

I believe this is a pretty powerful mechanism, and I’m hoping this will indeed happen at some point; the expected benefits are not only for the RDF/XML community that would get more data to churn: it is also a very good way for the microformats community to get a common inftrastructure to parse all the microformats, without having to write specific parsers for each of these formats.

And, as an aside, it offers a common way to describe HTML profiles, and using any XML language that one sees fit…

7 Responses to “GRDDL specification updated works with Microformats”

  1. Danny Says:

    Hi Dom, nice to hear of activity around GRDDL.

    I’ve just started sorting out hReview for GRDDLability, currently figuring out the additional vocab needed (building on, hopefully have the XSLT sorted over the weekend.

  2. Danny Ayers, Raw Blog Says:


    Gleaning Resource Descriptions from Dialects of Languages (GRDDL), info from Dom: GRDDL specification updated works with Microformats. They *are* useful! […]

  3. Raw Says:

    Semantic Reviews

    I’ve had lousy connectivity all morning and my Redland install’s currently bust, so took the time to get started on pulling the semantics out of hReview . I’m documenting as I go along: Expressing hReview Data in RDF and here’s…

  4. MiXTaPe » Don’t call me DOM » GRDDL specification updated works with Microformats Says:

    […] cification updated works with Microformats
    Posted by Lucas under Uncategorized 

    Don’t call me DOM » GRDDL specification updated works with Microformats […]

  5. MiXTaPe » Uppercase Semantic Web Says:

    […] ayoff. That doesn’t mean I refuse to see the value, and I have a nasty feeling that the functionality of microformats may require uppercase SW.

  6. dom Says:

    See also the related discussion in where the practical details of making XFN GRDDL-enabled are discussed.

  7. » Blog Archive » Approccio GRDDL e RDF Says:

    […] enti: -> Bridging XHTML, XML and RDF with GRDDL -> HTML, Metadata, and RDF -> GRDDL -> GRDDL specification updated works with Microformats -> GRDDL on the desk […]

Picture of Dominique Hazael-MassieuxDominique Hazaël-Massieux ( is part of the World Wide Web Consortium (W3C) Staff; his interests cover a number of Web technologies, as well as the usage of open source software in a distributed work environment.