RDFa Primer Bridging the Human and Data webs Presented by: Didit ( )

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

RDFa background In a traditional technology (ordinary html page) there are a large gap between what human and programs understand

RDFa technology RDFa used a generalize attributes from XHTML meta and link elements This allow user to annotate XHTML markup with semantic

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

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

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

RDFa example Labeling the title and author Use property and attribute Import existing DC vocabulary to express title and author

RDFa example Expressing multiple items per page

RDFa example Nesting cause overriding of the outer value

RDFa example Describing contact information

RDFa example Describing social networks

Benefit of RDFa Publisher independence Data reuse Self containments Schema modularity Evolvability