Download - RDFa Primer Bridging the Human and Data webs
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RDFa PrimerBridging the Human and Data webs
Presented by: Didit (2008-22485)
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RDFa introduction
RDFa, Resource Description Framework in attribute
Is a set of extension to XHTML now part of W3C recommendation Have a purpose
to augment web page visual data with machine readable hints
to reduce the gap between what user and programs understand from a web page
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RDFa background
In a traditional technology (ordinary html page) there are a large gap between what human and programs understand
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RDFa technology
RDFa used a generalize attributes from XHTML meta and link elements
This allow user to annotate XHTML markup with semantic
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RDFa technology
Set of attribute provide by RDFa about: a URI specifying the resource of the
metadata rel & rev: specifying a relationship with another
resource href, src, resource: specifying the partner
resource property: specifying a property for the content of
an element
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RDFa technology
Content: optional attribute that override the content of the elements when using the property attribute
Datatype: optional attribute that specifies the datatype of text specified
Typeof: optional attribute that specifies the RDF type of subject
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RDFa example
Consider Alice a bloger who wants to declare her content to be freely reusable as long as she receive due credit when her article are cited
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RDFa example
Labeling the title and author Use property and attribute Import existing DC vocabulary to express title and
author
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RDFa example
Expressing multiple items per page
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RDFa example
Nesting cause overriding of the outer value
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RDFa example
Describing contact information
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RDFa example
Describing social networks
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Benefit of RDFa
Publisher independence Data reuse Self containments Schema modularity Evolvability