メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.121570485912 42.9724718171076, 144.118694300614 42.9711133675155, 144.12046899701 42.9689478542707, 144.121552259299 42.9696030493399, 144.122992283967 42.9704633805734, 144.123217951725 42.9705970386541, 144.121570485912 42.9724718171076)) ^^http://www.opengis.net/ont/geosparql#wktLiteral