TLFeBooK List of figures 1 A hierarchy lligent personal agents A layered approach to the Semantic Web 2.1 Tree representation of an XML document 2.2 Tree representation of a library document 2. 4 Tree representation of query 5 2.5 A template (sLT as tree transformation 3.1 Graph representation of tripl 65 3.3 Representation of a tertiary predicate 3.4 Representation of a tertiary predicate 3.5 a hierarchy of classes 3.6 RDF and RDFS layers 3.7 Subclass hierarchy of some modeling primitives of RDFS 8 Instance relationships of some modeling primitives of RDFS 3.9 Class hierarchy for the motor vehicles example 4.1 Subclass relationships between OWL and RDF/RDFS 115 4.2 Inverse properties 19 4.3 Classes and subclasses of the African wildlife ontology 4. 4 Branches are parts of trees 129 4.5 Classes and subclasses of the printer ontology TLFeBOoKList of Figures 1.1 A hierarchy 11 1.2 Intelligent personal agents 15 1.3 A layered approach to the Semantic Web 18 2.1 Tree representation of an XML document 31 2.2 Tree representation of a library document 46 2.3 Tree representation of query 4 48 2.4 Tree representation of query 5 48 2.5 A template 52 2.6 XSLT as tree transformation 56 3.1 Graph representation of triple 65 3.2 A semantic net 65 3.3 Representation of a tertiary predicate 68 3.4 Representation of a tertiary predicate 78 3.5 A hierarchy of classes 82 3.6 RDF and RDFS layers 84 3.7 Subclass hierarchy of some modeling primitives of RDFS 87 3.8 Instance relationships of some modeling primitives of RDFS 87 3.9 Class hierarchy for the motor vehicles example 90 4.1 Subclass relationships between OWL and RDF/RDFS 115 4.2 Inverse properties 119 4.3 Classes and subclasses of the African wildlife ontology 129 4.4 Branches are parts of trees 129 4.5 Classes and subclasses of the printer ontology 133 TLFeBOOK TLFeBOOK