TAILIEUCHUNG - Web Technologies phần 5

patrollers, các nhà hoạch định chính sách, các chuyên gia vấn đề, bảo trì nội dung, các nhà phát triển phần mềm và vận hành hệ thống (Riehle, 2006), tất cả đều tạo ra một môi trường mở để chia sẻ thông tin kiến thức cho một nhóm lớn người dùng. | Semantic Web for Media Convergence metadata structure . a tree using RDF. The RDF model is based on the graph so it is easy to model a tree using it. Moreover we do not need to worry about the semantics loose produced by structure-mapping. We have formalised the underlying semantics into the corresponding ontologies and we will attach them to RDF metadata using the instantiation relation rdf type. The structure-mapping is based on translating XML metadata instances to RDF ones that instantiate the corresponding constructs in OWL. The more basic translation is between relation instances from xsd elements and xsd attributes to rdf Properties. Concretely owl ObjectProperties for node to node relations and owl DatatypeProperties for node to values relations. However in some cases it would be necessary to use rdf Properties for xsd elements that have both data type and object type values. Values are kept during the translation as simple types and RDF blank nodes are introduced in the RDF model in order to serve as source and destination for properties. They will remain blank for the moment until they are enriched with semantic information. The resulting RDF graph model contains all that we can obtain from the XML tree. It is already semantically enriched due to the rdf type relation that connects each RDF properties to the owl ObjectProperty or owl DatatypeProperty it instantiates. It can be enriched further if the blank nodes are related to the owl Class that defines the package of properties and associated restrictions they contain . the corresponding xsd complexType. This semantic decoration of the graph is formalised using rdf type relations from blank nodes to the corresponding OWL classes. At this point we have obtained a semantics-enabled representation of the input metadata. The instantiation relations can now be used to apply OWL semantics to metadata. Therefore the semantics derived from further enrichments of the ontologies . integration links .

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