@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix strdf: <http://strdf.di.uoa.gr/ontology#> .
@prefix : <http://strdf.di.uoa.gr/ontology#> .
@base <http://strdf.di.uoa.gr/ontology> .

<http://strdf.di.uoa.gr/ontology> rdf:type owl:Ontology .

strdf:geometry 	rdf:type rdfs:Datatype ;
				dc:contributor "Kostis Kyzirakos"@en ;
				dc:contributor "Manos Karpathiotakis"@en ;
				dc:contributor "Manolis Koubarakis"@en;
				dc:date "2011-08-11"^^xsd:date ;
				dc:description "A serialization of a geometric object"@en ;
				rdfs:label "A geometric object."@en ;
				rdfs:comment "The serialization of a geometric object."@en .
				
strdf:WKT 	rdf:type rdfs:Datatype ;
			rdfs:subClassOf strdf:geometry ;
			dc:contributor "Kostis Kyzirakos"@en ;
			dc:contributor "Manos Karpathiotakis"@en ;
			dc:contributor "Manolis Koubarakis"@en ;
			dc:date "2011-08-11"^^xsd:date ;
			dc:description "The Well-known Text serialization of a geometric object"@en ;
			rdfs:label "WKT	serialization of a geometric object."@en ;
			rdfs:comment "The Well-known Text serialization of a geometric object."@en ;
			owl:sameAs <http://www.opengis.net/ont/geosparql#wktLiteral> .

strdf:GML 	rdf:type rdfs:Datatype ;
			rdfs:subClassOf strdf:geometry ;
			dc:contributor "Kostis Kyzirakos"@en ;
			dc:contributor "Manos Karpathiotakis"@en ;
			dc:contributor "Manolis Koubarakis"@en ;
			dc:date "2011-08-11"^^xsd:date ;
			dc:description "The GML serialization of a geometric object"@en ;
			rdfs:label "GML serialization of a geometric object."@en ;
			rdfs:comment "The Geography Markup Language serialization of a geometric object."@en ;
			owl:sameAs <http://www.opengis.net/ont/geosparql#gmlLiteral> .


strdf:period  rdf:type rdfs:Datatype ;
			dc:contributor "Konstantina Bereta"@en ;
			dc:contributor "Manolis Koubarakis"@en;
			dc:date "2012-12-01"^^xsd:date ;
			dc:description "Representation of a period of time"@en ;
			rdfs:label "A period of time."@en ;
			rdfs:comment "Representation of a period of time."@en .