メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.379865082062 43.7791260311387, 142.37913031186 43.7793522879485, 142.378346562682 43.7795958748385, 142.377664022667 43.7783946781489, 142.378455535284 43.7781685101347, 142.379201889152 43.7779414364052, 142.379865082062 43.7791260311387)) ^^http://www.opengis.net/ont/geosparql#wktLiteral