メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.399604372559 44.1642243107176, 142.398919304433 44.1641220464277, 142.398636066795 44.1634786959186, 142.39879581795 44.162801385524, 142.399938047159 44.1629968213445, 142.39975351192 44.1635696383733, 142.399604372559 44.1642243107176)) ^^http://www.opengis.net/ont/geosparql#wktLiteral