メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.709681887619 44.3709692827667, 141.708589897068 44.3716623462165, 141.707500608814 44.3707967552708, 141.708584399069 44.3700995776941, 141.708586419796 44.3700982858664, 141.709681887619 44.3709692827667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral