Bridging XHTML, XML and RDF with GRDDL

Dominique Hazaël-Massieux, W3C

XTech 2005, Amsterdam

Thursday 26 May, 2005

A long time ago
in a Galaxy Far, Far away...

on the Web-Wide World

The linguistic situation

same alphabet and same punctuation
but order of words not always the same

grammar rules different
no common lexicon

But why bother?

compartementalized knowledge
each country re-invents the wheel
nobody can safely go across the continent

The grammarian solution

each country describe its language grammar rules
some suggested putting this grammar at the entrance of the countries
of course, many different ways to describe these rules

but still no way to translate !

Here come the lexicographers!

let's create dictionaries of translations
but instead of creating N² dictionaries, let's pick one referent language
the mountains weirdos claim their language can describe anything, let's try it
let's make sure anyone can easily GET these dictionaries

May the Foo be with you

Pick a dictionary below if you don't have one

Disclaimer

Any ressemblance with real situations, people or markup languages would be purely coincidental.

GRDDL

Gleaning Resources Descriptions from Dialects of Languages
extracts RDF semantics from XHTML and XML documents using XSLT
2 retrieval mechanisms:
- a link rel in XHTML
- an attribute on the root element in generic XML
namespaces document and profile documents as pivot

XML GRDDL processing


<root dataview:transformation="foo-to-rdf.xsl" 
   xmlns="http://example.net/foo"
   xmlns:dataview="http://www.w3.org/2003/g/data-view">

Processing an XML document with a dataview:transformation link

XHTML GRDDL processing


<html xmlns="http://www.w3.org/1999/xhtml">
  <head profile="http://www.w3.org/2003/g/data-view" >
  ...
  <link rel="transformation" href="myhtml-to-rdf" />
  </head>

e.g. DanC's home page, or my list of visited countries.

Recursive GRDDL processing

Applied to an XFN document


<html xmlns="http://www.w3.org/1999/xhtml">
  <head profile="http://gmpg.org/xfn/11">
  ...
  <a href="http://www.w3.org/People/Connolly/"
      rel="co-worker">DanC's homepage</a>

Recursive GRDDL processing

Applied to an XFN document

Getting a transformation for the XFN document from the extracted RDF

Use cases

Microformats and lowercase semantic web, e.g. XFN
Creative Commons across XML Languages
annotations to XML Schemas

A common semantic processing across XML vocabularies and XHTML dialects.

Status

a W3C Team Submission last published May 16
a Test Suite
6 implementations (in Python, C, XSLT, Java), including Raptor (redland), and Piggy-Bank, a Firefox extension

Open questions

W3C Recommendation?
more retrieval mechanisms?
technical questions regarding XSLT

In the future

XHTML2 and RDF/A are compatible with GRDDL
better integration of Web data on the desktop (cf. Piggy Bank)
soften the borders between the XML Web, the RDF Web and the (X)HTML Web

References and contact

dom@w3.org
GRDDL specification: http://www.w3.org/TR/grddl/
links to an on-line demo

Bridging XHTML, XML and RDF with GRDDL

A long time ago
in a Galaxy Far, Far away...

A Babel Continent

The linguistic situation

But why bother?

The grammarian solution

Here come the lexicographers!

May the Foo be with you

Disclaimer

GRDDL

XML GRDDL processing

XHTML GRDDL processing

Recursive GRDDL processing

Recursive GRDDL processing

Use cases

Status

Open questions

In the future

References and contact

Thanks

Bridging XHTML, XML and RDF with GRDDL

A long time ago in a Galaxy Far, Far away...

A Babel Continent

The linguistic situation

But why bother?

The grammarian solution

Here come the lexicographers!

May the Foo be with you

Disclaimer

GRDDL

XML GRDDL processing

XHTML GRDDL processing

Recursive GRDDL processing

Recursive GRDDL processing

Use cases

Status

Open questions

In the future

References and contact

Thanks

A long time ago
in a Galaxy Far, Far away...