rdfa in a nutshell v2
Post on 27-Jun-2015
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fabien, gandon, inria
RDFain a nutshell
many databuried and dormant in web pages
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deep
web
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in particular data in the
embedding explicitseveral initiatives to make data
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for specific, common, concise data
for custom data, RDF data, multiple schemas
your dataRDFa = a domain-independent way to explicitly
embed
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RDF dataRDFa = a domain-independent way to explicitly
embed
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RDFa stands for…
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RDF… in HTML … attributes
RDFa in attributes of a web page to…
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… transfer data from an application
to another through the web.
… write data only once for web
users and web applications.
weaving RDFain web pages
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RDFa step 1declare the schemas you are using
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RDFa step 2use attributes to mark, type and add data
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RDFa step 3let RDFa agents extract RDF from the document
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web pagetake this minimal
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web pagedon't look at the code of this<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:cal="http://www.w3.org/2002/12/cal/icaltzd#"
xmlns:xs="http://www.w3.org/2001/XMLSchema#" >
<body>
<p about="#event1" typeof="cal:Vevent">
<b property="cal:summary">Weekend off in Iona</b>:
<span property="cal:dtstart" datatype="xs:date">2006-10-21
</span> to
<span property="cal:dtend" datatype="xs:date">2006-10-23
</span>.
see <a rel="cal:url" href="http://freetime.example.org/">
Free time web site</a> for info on
<span property="cal:location">Iona, UK</span>.
</p>
</body>
</html>
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web pageschemas for data in this<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:cal="http://www.w3.org/2002/12/cal/icaltzd#"
xmlns:xs="http://www.w3.org/2001/XMLSchema#" >
<body>
<p about="#event1" typeof="cal:Vevent">
<b property="cal:summary">Weekend off in Iona</b>:
<span property="cal:dtstart" datatype="xs:date">2006-10-21
</span> to
<span property="cal:dtend" datatype="xs:date">2006-10-23
</span>.
see <a rel="cal:url" href="http://freetime.example.org/">
Free time web site</a> for info on
<span property="cal:location">Iona, UK</span>.
</p>
</body>
</html>
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web pagedata seen by users viewing this<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:cal="http://www.w3.org/2002/12/cal/icaltzd#"
xmlns:xs="http://www.w3.org/2001/XMLSchema#" >
<body>
<p about="#event1" typeof="cal:Vevent">
<b property="cal:summary">Weekend off in Iona</b>:
<span property="cal:dtstart" datatype="xs:date">2006-10-21
</span> to
<span property="cal:dtend" datatype="xs:date">2006-10-23
</span>.
see <a rel="cal:url" href="http://freetime.example.org/">
Free time web site</a> for info on
<span property="cal:location">Iona, UK</span>.
</p>
</body>
</html>
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web pagedata for an RDFa agent in this<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:cal="http://www.w3.org/2002/12/cal/icaltzd#"
xmlns:xs="http://www.w3.org/2001/XMLSchema#" >
<body>
<p about="#event1" typeof="cal:Vevent">
<b property="cal:summary">Weekend off in Iona</b>:
<span property="cal:dtstart" datatype="xs:date">2006-10-21
</span> to
<span property="cal:dtend" datatype="xs:date">2006-10-23
</span>.
see <a rel="cal:url" href="http://freetime.example.org/">
Free time web site</a> for info on
<span property="cal:location">Iona, UK</span>.
</p>
</body>
</html>
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web pagedata shared by both in this<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:cal="http://www.w3.org/2002/12/cal/icaltzd#"
xmlns:xs="http://www.w3.org/2001/XMLSchema#" >
<body>
<p about="#event1" typeof="cal:Vevent">
<b property="cal:summary">Weekend off in Iona</b>:
<span property="cal:dtstart" datatype="xs:date">2006-10-21
</span> to
<span property="cal:dtend" datatype="xs:date">2006-10-23
</span>.
see <a rel="cal:url" href="http://freetime.example.org/">
Free time web site</a> for info on
<span property="cal:location">Iona, UK</span>.
</p>
</body>
</html>
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web pagewhat an RDFa agent knows
from this
#event1 isA cal:Vevent
#event1 cal:summary "Weekend off in Iona"
#event1 cal:dtstart "2006-10-21"^^xs:date
#event1 cal:dtend "2006-10-23"^^ xs:date
#event1 cal:url <http://freetime.example.org/>
#event1 cal:location "Iona, UK"
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messagetake away
don't buryyour data in some HTML page
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data…when you publish a page that contains
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explicitdo make the embedding
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fabien, gandon
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