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Before we can use a set of terms, we need a precise indication of what specific vocabularies are being used. A standard initial component of an ontology includes a set of XML namespace declarations enclosed in an opening rdf:RDF tag. These provide a means to unambiguously interpret identifiers and make the rest of the ontology presentation much more readable. A typical OWL ontology begins with a namespace declaration similar to the following. Of course, the URIs of the defined ontologies will not usually be w3.org references. <rdf:RDF     xmlns     ="http://www.w3.org/TR/2004/REC-owl-guide-20040210/wine#"     xmlns:vin ="http://www.w3.org/TR/2004/REC-owl-guide-20040210/wine#"            xml:base  ="http://www.w3.org/TR/2004/REC-owl-guide-20040210/wine#"            xmlns:food="http://www.w3.org/TR/2004/REC-owl-guide-20040210/food#"         xmlns:owl ="http://www.w3.org/2002/07/owl#"     xmlns:rdf ="http://www.w3.org/1999/02/22-rdf-syntax-ns#"     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"     xmlns:xsd ="http://www.w3.org/2001/XMLSchema#"> The first two declarations identify the namespace associated with this ontology. The first makes it the default namespace, stating that unprefixed qualified names refer to the current ontology. The second identifies the namespace of the current ontology with the prefix vin:. The third identifies the base URI for this document (see below ). The fourth identifies the namespace of the supporting food ontology with the prefix food:. The fifth namespace declaration says that in this document, elements prefixed with owl: should be understood as referring to things drawn from the namespace called http://www.w3.org/2002/07/owl#. This is a conventional OWL declaration, used to introduce the OWL vocabulary. OWL depends on constructs defined by RDF, RDFS, and XML Schema datatypes. In this document, the rdf: prefix refers to things drawn from the namespace called http://www.w3.org/1999/02/22-rdf-syntax-ns#. The next two namespace declarations make similar statements about the RDF Schema (rdfs:) and XML Schema datatype (xsd:) namespaces.