The GRDDL Working Group closed on 10 December 2008.

The mission of this Working Group is to complement the concrete RDF/XML syntax with a mechanism to relate other XML syntaxes (especially XHTML dialects or "microformats") to the RDF abstract syntax via transformations identified by URIs.

GRDDL is a mechanism for Gleaning Resource Descriptions from Dialects of Languages. The GRDDL specification introduces markup for declaring that an XML document includes gleanable data and for linking to an algorithm, typically represented in XSLT, for gleaning the resource descriptions from the document.

A GRDDL Use Cases document provides motivating examples. A GRDDL Primer demonstrates the mechanism on XHTML documents which include widely-deployed dialects, more recently known as microformats.

GRDDL W3C Standards and Notes

• W3C Recommendation 11 September 2007: Gleaning Resource Descriptions from Dialects of Languages (GRDDL)
  editor's draft
• W3C Recommendation 11 September 2007: GRDDL Test Cases
  editor's draft
• W3C Working Group Note 6 April 2007: GRDDL Use Cases: Scenarios of extracting RDF data from XML documents
  editor's draft
• W3C Working Group Note 28 June 2007: GRDDL Primer
  editor's draft

Also of Interest

• W3C GRDDL Service: Extract RDF using GRDDL with this online service. Also triplr supports GRDDL.
• GRDDL namespace document
• List of GRDDL Implementations
• Mappings of Microformats to RDF
• Danny Ayer's GRDDL Quick Reference Card
• Henry S. Thompson's Formalising the Proximate Semantics of XML Languages with UML, OWL and GRDDL paper presented at XTech 2007
• Chimezie Ogbuji's Tools for Next Generation of Content Management Systems: XML, RDF, and GRDDL (OpenOffice Presentation Format)
• Dan Connolly and Harry Halpin's GRDDL Tutorial: Deploying Web-scale Mash-ups by Linking Microformats and the Semantic Web presented at WWW 2007.
• W3C Press Release about GRDDL reaching Recommendation status

These are documents produced outside the GRDDL Working Group that may be of interest to people interested in GRDDL. Please alert the Chair of the Working Group if you know of any material that you think merits inclusion.

Schedule of Deliverables

• Jul 2006: Group Formation
• Oct 2006: First public Working Draft of GRDDL spec
• ... see history below.
• Sep 2007: Recommendation
• Q3 2007: Close Group

The working group schedule is an estimate based on the schedule in the charter and subject to negotiation with peer groups via the Semantic Web Coordination Group. See also detailed schedule in preparation for last call.

Group Membership and Joining

We encourage new members of the group to introduce themselves by email; for example, David Booth, Ronald P. Reck, Murray Maloney, Harry Halpin, Chimezie Ogbuji, Fabien Gandon, Ian Davis, and Dan Connolly. The full GRDDL WG participants list is available to W3C members.

If you want to join the group:

• If you're affiliated with a W3C member organization
  1. Use the form for getting a W3C account
  2. Have your AC representative nominate you using the form for joining this WG.
• Otherwise, contact the chair and team contact about invited expert status. That will involve getting an account and filling out a form for copyright, patent, etc. policies.

Charter, Meeting Records, and History

The GRDDL Working Group Charter shows what the W3C has asked this working group to do. The following events chart our progress:

• in September 2007: teleconferences Sept 5
• in August 2007: teleconferences Aug 22 8 Aug, 1 Aug
• 16 July 2007: spec, test cases to Proposed Recommendation

  request

• in June 2007: teleconferences 27 Jun, 20 Jun, 13 Jun, 6 Jun
• 8 May 2007: GRDDL tutorial at WWW2007: Deploying Web-scale Mash-ups by Linking Microformats and the Semantic Web by Dan Connolly and Harry Halpin
• 2 May 2007: GRDDL spec CR; GRDDL Test Cases Last Call WD

  request

• in May 2007: teleconferences 30 May, 23 May, 16 May, 2 May
• in Apr 2007: teleconferences 25 Apr, 18 Apr, 11 Apr, 4 Apr
• in March: teleconferences 28 Mar, 21 Mar, 14 Mar, 7 Mar
• in Feb 2007: teleconferences 7 Feb, 14 Feb, 21 Feb, 28 Feb
• Jan 2007: GRDDL support announced in redland release 4.14; GRDDL Reader for Jena announced
• in Jan 2007: teleconferences 10 Jan 17 Jan, 24 Jan, 31 Jan
• in Dec 2006: teleconferences 6 Dec , 13 Dec, 20 Dec
• in Nov 2006: teleconferences 1 Nov, 15 Nov, 22 Nov
• 24 October 2006: World Wide Web Consortium Releases First Version of GRDDL Specification. GRDDL Links the Semantic Web and Microformats. Press release accompanies GRDDL Specification, homepage news item. Coverage includes: internetnews.com.
• in Oct 2006: teleconferences 4 Oct, 11 Oct, 18 Oct, 25 Oct
• 2 October 2006: First Public Working Draft of primer, use cases
• in Sep 2006: teleconferences 6 Sep, 13 Sep, 20 Sep, 27 Sep
• in Aug 2006: teleconferences 9 Aug, 16 Aug, 23 Aug , 30 Aug
• 2006-07-14: Semantic Web Activity Grows to include GRDDL, Deployment Working Groups. See also: form for joining this WG, announcement to members.
• 2006-05-17: Call for review (member confidential)

GRDDL history

These events pre-date the Working Group:

• Microformats Podcast by Alex Barnett with Tantek Çelik, Dan Connolly and Rohit Khare March 31, 2006
• GRDDL charter input call for interest and survey 24 Jan 2006
• Semantic Web Data Integration with hCalendar and GRDDL presentation by Dan Connolly at XML 2005 in Atlanta in November.
• Bridging XHTML, XML and RDF with GRDDL, May 2005 Dominique Hazaël-Massieux, XTech 2005, Amsterdam
• Gleaning Resource Descriptions from Dialects of Languages (GRDDL), Hazaël-Massieux and Connolly May 2005
• Gleaning Resource Descriptions from Dialects of Languages (GRDDL) presented to 9 Feb 2004 TAG meeting, March 2004 SWIG meeting

W3C Working Group Resources

• Art of Consensus Guide W3C member confidential
• World Wide Web Consortium Process Document 14 October 2005
• W3C Groups, Participants (dbwg) W3C member confidential