]> Wob Web of Belief Ontology Core Elements v1.4. This file is created by Li Ding, and it specifies the core elements of WOB ontology. 10 Feb 2006, revised $Date: 10:49 PM 2/10/2006$ Semantic Web Document The most generic class of semantic web documents each of which contains one more more RDF graphs. has Grammar The syntactic grammar of a semantic web document RDF/XML The Semantic Web document is using RDF/XML grammar N3 The Semantic Web document is using Notation 3 grammar NTriples The Semantic Web document is using NTriples grammar uses Grammar It indicates whether the semantic web knowledge is embedded. While pure semantic web documents are completely written using semantic web languages, some conventional web document may have some semantic web knowledge embedded, i.e. only a span of text in the document serializes a RDF graph. Example embedded semantic web documents are html documents containing RDF metadata such as creative commons license, PDF documents containing XMP metadata. RDF Graph Reference The most generic class of RDF graph reference. It can reference an abitary set of triples in an RDF graph. rdfs:Statement is its subclass. RDF Graph Reference Union A special class of RDF graph reference. It references the union of the RDF graphs referenced by member source graphs. 1 is union of The specified RDF graph is the union of its member RDF graphs. It is constrcuted by merging the graphs renfereced in the list items. Its range is rdf:List, and the range of its list items are of type wob:GraphReference. Semantic Web Term It refers to the special class of RDF resources with URI and has class or property usage in at least one semantic web documents. 1 Semantic Web Namespace it refers to the special class of RDF resources which has been used as the namespace of RDF resources in practice. provenance The most generic provenance property of an RDF resource, which could be an instance of RDF graph reference, an instance of semantic web document, any class-instance, or even a untyped resource. has description In definition-provenance: The present RDF resource is described in the source RDF graph. has meta description in a combination of definition-provenance and where-provenance: The present RDF resource is used as a class or property by the RDF graph serialized by the Semantic Web document. This is practically useful since Semantic Web document is the transmission unit of RDF graph on the Web. The present resource is defined as an instance of rdfs:Class by rdf:type predicate in the target RDF graph. The present resource is defined as an instance of rdf:Property by rdf:type predicate in the target RDF graph. The present resource has at least one populated class-instance in the target RDF graph. A class X is said populated if there exists a triple ( _a rdf:type X) in the RDF graph where _a can be any resource. The present resource has at least one property-instance in the target RDF graph. A property Y is said populated if there exists a triple ( _a Y _b) in the RDF graph where _a and _b can be any resource. The present resource is referenced as an instance of rdfs:Class in a triple whose predicate is from semantic web languages (i.e. RDF, RDFS, OWL, DAML) but never by a triple with rdf:type as predicate in the target RDF graph. The present resource is referenced as an instance of rdf:Property in a triple whose predicate is from semantic web languages (i.e. RDF, RDFS, OWL, DAML) but never by a triple with rdf:type as predicate in the target RDF graph. has source document where-provenance: The present RDF graph may be parsed from the source semantic web document. This property enables us to reconstruct the referenced RDF graph merging the RDF graphs in the the semantic web documents.It is subproperty of {\em dc:source}. has source graph why-provenance: The present RDF graph may be derived from the source RDF graph in whole or in part. This property enables us to reconstruct the referenced RDF graph merging the RDF graphs in the the semantic web documents. It is subproperty of {\em dc:source}. has creator whom-provenance: the reference RDF graph is created by the source agent. {\em dc:creator} is defined as ``An entity primarily responsible for making the content of the resource''; however, the ``content of the resource'' is not very clear. Therefore, we restrict the domain to an RDF graph which encodes semantic web knowledge (or content). has publisher whom-provenance: the present Document is published on the Web by the source agent. dc:publisher is defined as "An entity responsible for making the resource available"; however, it does not specify where and in what form the resource is available. Therefore, we restrict the domain to a document because agents share knowledge by making corresponding documents available on the Web. Agent Assertion The class of assertions made by agents. has Owner Agent the agent that made the assertion Agent Assertion The class of belief assertions each of which represents an agent's belief state about about the RDF graph referenced by an instance of wob:GraphReference. has target graph the target RDF graph being asserted. Agent Assertion The class of trust assertions each of which represents an agent's trust in another agent. has Agent the target agent being asserted