RDF – RESOURCE DESCRIPTION FRAMEWORK Antonio Bucchiarone FBK-IRST Trento, Italy 20 Novembre 2009.

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Presentation transcript:

RDF – RESOURCE DESCRIPTION FRAMEWORK Antonio Bucchiarone FBK-IRST Trento, Italy 20 Novembre 2009

Esempio di documento RDF W3Schools Jan Egil Refsnes

RDF Resource, Property, and Property Value  RDF identifies things using Web identifiers (URIs), and describes resources with properties and property values.  A Resource is anything that can have a URI, such as "  A Property is a Resource that has a name, such as "author" or "homepage"  A Property value is the value of a Property, such as "Jan Egil Refsnes" or " (note that a property value can be another resource)

 The following RDF document could describe the resource " Jan Egil Refsnes

RDF Statements  The combination of a Resource, a Property, and a Property value forms a Statement (known as the subject, predicate and object of a Statement).

RDF Statements  Statement: "The author of is Jan Egil Refsnes".  The subject of the statement above is:  The predicate is: author  The object is: Jan Egil Refsnes  Statement: "The homepage of is  The subject of the statement above is:  The predicate is: homepage  The object is:

RDF File: First lines  Example: Example: 

RDF File – cont.  The first line of the RDF document is the XML declaration. The XML declaration is followed by the root element of RDF documents:.  The xmlns:rdf namespace, specifies that elements with the rdf prefix are from the namespace " ns#".  The xmlns:cd namespace, specifies that elements with the cd prefix are from the namespace "

RDF File – cont.  The element contains the description of the resource identified by the rdf:about attribute.  The elements:,,, etc. are properties of the resource.

RDF Validator  RDF Online Validator  W3C's RDF Validation Service is useful when learning RDF. W3C's RDF Validation Service  Here you can experiment with RDF files.  The online RDF Validator parses your RDF document, checks your syntax, and generates tabular and graphical views of your RDF document.

RDF Validator  Copy and paste the example below into W3C's RDF validator: W3Schools.com Jan Egil Refsnes  The result should be

RDF Main Elements  is the root element of an RDF document. It defines the XML document to be an RDF document. It also contains a reference to the RDF namespace...Description goes here...

RDF Main Elements  The element identifies a resource with the about attribute.  The element contains elements that describe the resource: <rdf:Description rdf:about=" Burlesque"> Bob Dylan USA Columbia