:Resource] annotation [rdfs:Resource � rdfs:Resource] annotation [rdfs:Resource � rdfs:Resource] complex values the generic class of literal values the class of typed literals (c.f. XMLSchema) � rdfs:Class the class of rdf classes rdfs:subClassOf [rdfs:Class � rdfs:Class] subset relation Property � rdf:Property rdfs:subProperty

Swoogle is a crawler-based indexing and retrieval system for the Semantic Web documents – i.e., RDF or OWL documents. It analyzes the documents it discovered to compute useful metadata properties and relationships between them. The documents are also indexed by using an information retrieval system

approaches, which are basically due to the dual role of properties such as subclass and domain both as primitive constructs used in the definition of the RDF schema specification and as specific instances of RDF properties. We then discuss an approach for specifying RDF schemas, which distinguishes between a

Abstract This paper presents a minimalist program for RDF, by showing how one can do without several predicates and keywords of the RDF Schema vocabulary, obtaining a simpler language which preserves the original semantics. This approach is beneficial in at least two directions: (a) To have a

general graphs as Web resources, RGML defines graph, node, and edge as RDF classes and attributes of graphs (such as label and weight) as RDF properties. Some of these RDF properties establish relationships between graph, node, and edge instances. RDF Statements about graph elements involve subjects

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for representing information on the World Wide Web. It provides a data model for describing properties of resources in the web and their interrelationships. RDF Schema provides a basic type system for RDF models which is implemented in terms of classes and properties. These technologies are increasingly used

to discover the identifying properties of resources, allowing information to be aggregated from multiple databases without the need for constant identifiers. An HTTP implementation of an RDF Object Server has been developed and used to develop tools for W3C Working Groups. 1. Context and Background 1.1 RDF

Abstract. We describe RDF123, a highly flexible open-source tool for translating spreadsheet data to RDF. Existing spreadsheet-to-rdf tools typically map only to star-shaped RDF graphs, i.e. each spreadsheet row is an instance, with each column representing a property. RDF123, on the other hand

relationaldatabase perspective, these constraints are derived from the very nature of the RDF data model, which is based on a triple format. Recent research has attempted to address these constraints using a vertical-partitioning approach, in which separate two-column tables are constructed for each property