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W3C

GRDDL Data Views: Getting Started, Learning More

GRDDL is a technique forgleaningresourcedescriptions fromdialects oflanguages. It's a way of extracting Semantic Web data inRDF from XML formats (especially XHTML dialects ormicroformats) via transformations identified by URIs and typically expressed in XSLT. For full details, see theGRDDL specification.

Note: TheGRDDL specification is aW3C Recommendation. W3C welcomescomments by email, especially comments that reflect implementation experience.

To use GRDDL:

  1. If you're using a dialect (hDoap,Site Summaries,Embedded RDF,etc.) that already has an established GRDDL-compatible profile:
    1. Add the profile attribute:
      <html xmlns="http://www.w3.org/1999/xhtml">  <headprofile="http://purl.org/stuff/hdoap/profile">    <title>My Project</title>  </head>    ...</html>
    2. Look at the data expressed as RDF using theonline GRDDL demo service, and if you like, check its output with theW3C RDF Validation service, or with a tool more customized for your data, like theFOAF explorer.
    3. Let the GRDDL Working Group know how you're using GRDDL by sending mail to thepublic-grddl-comments list.
  2. If you're using an XHTML dialect (Dublin Core encoding,GeoURL markup,etc.) that has an existing transformation (dc-extract.xsl,grokGeoURL.xsl) ...
    1. Make links from your XHTML data to the transformation, using thetransformation link type:
      <html xmlns="http://www.w3.org/1999/xhtml">  <head profile="http://www.w3.org/2003/g/data-view">    <title>Some Document</title>    <link rel="transformation"       href="http://www.w3.org/2000/06/dc-extract/dc-extract.xsl" />    <meta name="DC.Subject"       content="ADAM; Simple Search; Index+; prototype" />    ...  </head>  ...</html>
    2. Reference the GRDDL profile to make it clear what that transformation link type means:
      <html xmlns="http://www.w3.org/1999/xhtml">  <headprofile="http://www.w3.org/2003/g/data-view">    <title>Some Document</title>    ...
    3. Check your data and let us know how it went asabove.

Questions?

If you just want to use GRDDL, that's all you need to know. If you're curious to learn more, read on...

GRDDL Namespace and Metadata Profile Reference

This document,http://www.w3.org/2003/g/data-view,is a metadata profile in the sense of the HTML specification, in section7.4.4.3 Meta data profiles.

The following term is introduced here as an XHTML link relationshipname and RDF property name:

The following terms are introduced here as RDF properties:

The following terms are bound to concepts from existing standards:

We provide asample GRDDL/XHTML implementation, and a more completesample GRDDL implementation and a technical specification,Gleaning Resource Descriptions from Dialects of Languages (GRDDL), as a specification.

References

Acknowledgements and Colophon

This document usesEmbedded RDF to encodeDescription of a Project (DOAP) data as well as RDF Schema data and one or twoRDDL properties. We have moved away from the RDDL syntax itself.

This document was inspired by theXFN getting started page. Previous versions usedXMDP (withgrokXMDP.xsl), but in documenting domains and ranges of properties, maintaining the XMDP convention of ids on thedt rather than thedd element were too awkward to maintain.

Dan Connolly forthe GRDDL Working Group
$Revision: 1.47 $ of $Date: 2007/10/31 02:59:16 $ by $Author: connolly $
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