Defines constants for RDF terms.
Expanded class hierarchy of RdfConstants
abstract class RdfConstants {
const RDF_TYPE = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type';
// RDF Schema terms.
const RDFS_CLASS = 'http://www.w3.org/2000/01/rdf-schema#class';
const RDFS_DOMAIN = 'http://www.w3.org/2000/01/rdf-schema#domain';
const RDFS_IS_DEFINED_BY = 'http://www.w3.org/2000/01/rdf-schema#isDefinedBy';
const RDFS_RANGE = 'http://www.w3.org/2000/01/rdf-schema#range';
const RDFS_SUB_CLASS_OF = 'http://www.w3.org/2000/01/rdf-schema#subClassOf';
// XSD datatypes.
const XSD_INTEGER = 'http://www.w3.org/2001/XMLSchema#integer';
const XSD_DOUBLE = 'http://www.w3.org/2001/XMLSchema#double';
const XSD_BOOLEAN = 'http://www.w3.org/2001/XMLSchema#boolean';
const XSD_STRING = 'http://www.w3.org/2001/XMLSchema#string';
}
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