RDF and OWL Sample Clauses

RDF and OWL. RDF (Resources Description Framework) attempts to address XML's xxxxx- tic limitations because XML is designed to provide an interchange format for weakly structured data by de ning the underlying data model in a schema. XML is purely syntactic / structural describes data on the object level and often encodes an application-speci c data model. It presents a simple model that can be used to represent any kind of data, in other word, a data model for meta-information. This data model consists of nodes connected by la- beled arc, where the nodes represent web resources and the arcs represent properties of these resources. It should be noted that the model is essentially a semantic network, although unlike many semantic networks, it does not provide inheritance. EDIT: The nodes/arcs model also means that RDF is inherently , however, this does not restrict expressivity of the language be- cause any n-array relation can represented as a sequence of binary relation. RDF can be change using an XML serialization syntax, as follow: <?xml version= 1.0 ?> <rdf:RDF xmlns= xxxx://xxx.x0.xxx/1999/02/22-rdf-syntax-ns# xmlns:g= xxxx://xxx.xxx/general#> <rdf:Description rdf:about= //http:xxx.xx.xx.xx/xxxxxxxxxxx > <rdf:type rdf:resources= xxxx://xxx.xxx/road#mainroad /> <g:name>X X Xxxxxxx road</g:name> </rdf:Description> </rdf:RDF> The basic syntax consists of a rdf:Description element which contains a set of property elements. The about rdf:attribute identi es which resource is described. The property rdf:type is used to express that a resource is a member of a given class, and is equivalent to the instance-of link used in many semantic nets and frame systems. There are many variation of abbreviated in RDF syntax. To prevent accidental name of concept between di erent vocabularies, RDF uses XML namespace for each vocabulary. This approach has two disadvantage. First, it is possible to write RDF statements such that it is ambiguous as to whether certain tags are RDF or intermeshed tags from another namespace. Second, namespaces are not transitive, which means that each RDF section must explicitly specify the namespace for every schema that is reference in that section, even for schemas that were extended bay schema whose namespace has already been speci ed. RDF schema allow users to create schemas of standard classes and prop- erties using RDF. For this purpose, the speci cation de nes a number of classes and properties that have speci c semantic. A signi cant weakness of ...
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RDF and OWL. 74 4.1.3 Peer's Representation . . . . . . . . . . . . . . . . . . . 75 4.2 The Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . 75 4.2.1 Similarity Measurement . . . . . . . . . . . . . . . . . 77 4.2.1.1 Label Matching . . . . . . . . . . . . . . . . . 77 4.2.1.2 Internal Structure . . . . . . . . . . . . . . . 80 4.2.1.3 External Structure . . . . . . . . . . . . . . . 81 4.2.2 Agreement Unit . . . . . . . . . . . . . . . . . . . . . . 83 4.3 Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 4.4 Query Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 4.5 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 4.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 5 Result of Prototype 102 5.1 Prototype . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 5.2 Experimental Setup . . . . . . . . . . . . . . . . . . . . . . . . 104 5.2.1 Infrastructure . . . . . . . . . . . . . . . . . . . . . . . 104 5.2.2 Common Ontology and Export Schema . . . . . . . . . 105 5.3 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 5.4 Result and Discussion . . . . . . . . . . . . . . . . . . . . . . 107 5.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 6 Conclusion and Future Work 110 6.1 Research Objective . . . . . . . . . . . . . . . . . . . . . . . . 110 6.2 Achievements . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 6.3 Constribution . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 6.4 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 Bibliography 115 x List of Figures
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