メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.262668062213 44.0285242853911, 144.262211372493 44.0287775108211, 144.261749982858 44.0286040894646, 144.262095515025 44.0280842474269, 144.262929441021 44.028368801187, 144.262668062213 44.0285242853911)) ^^http://www.opengis.net/ont/geosparql#wktLiteral