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

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

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?
  • See mailing list post, 2007-09-27

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

• …