メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348503773187 44.4855265906057, 142.348485765424 44.4855210171359, 142.348387198213 44.4854904804934, 142.347660410409 44.4852653663978, 142.347955190278 44.4846188688286, 142.348814038274 44.4848320908808, 142.348503773187 44.4855265906057)) ^^http://www.opengis.net/ont/geosparql#wktLiteral