grddl

GRDDL

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Introduction

GRDDL (pronounced "griddle") is a mechanism for Gleaning Resource Descriptions from Dialects of Languages. It is a technique for obtaining RDF data from XML documents and in particular XHTML pages. GRDDL transformations can be made for almost any dialect, including microformats.

Implementations

• W3C GRDDL Service
• Triplr - construct URL as http://triplr.org/rdf/example.com/page.htm

Profiles

• Vote-Links (dead!)

Transformations

hCalendar

• http://www.w3.org/2002/12/cal/glean-hcal.xsl

hCard

• http://www.w3.org/2006/vcard/hcard2rdf.xsl
• http://norman.walsh.name/2005/12/12/examples/hcard2rdf.xsl

vote-links

• http://rdf.opiumfield.com/vote/votelinks.xsl

Issues

• Is GRDDL in HTML 4.01 OK, or is it just for XHTML?
  • Surely parsers can convert valid HTML4.01 to XHTML, perhaps using HTML-Tidy, before parsing it?
    • The specification states that it is intended for XML and XHTML, but 'profile' is in the HTML4 specification. Parsers can implement Tidy or other conversion routines, but do not have to. --TomMorris 03:49, 13 Oct 2007 (PDT)
      • Restricting GRDDL to XHTML would seem to be unnecessarily limiting. Andy Mabbett 04:00, 13 Oct 2007 (PDT)
  • See mailing list post, 2007-09-27

Essentially dead

• As someone who was an early proponent of GRDDL, I'd state that as of 2015-03, it is essentially dead along with any profile-based metadata systems including xmdp. The GRDDL specification relies on the profile attribute which has been deprecated in HTML5. Evidence to that effect: the W3C GRDDL reference service is offline, no attempt has been made to build an alternative that is HTML5-compliant (such as implementing html5-profile). It is probably time to call time of death on GRDDL and profile-uris. —Tom Morris 16:51, 16 March 2015 (UTC)

References

• GRDDL Specification
• GRDDL Primer

Further reading

• Bootstrapping the Semantic Web with GRDDL, Microformats, and RDFa (tutorial)
• W3C's GRDDL Press Release
• …

Criticisms

• 2007-07-29 - Microformats aren't an answer to the Semantic Web

See also

• …