メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4187500 35.5000000, 135.4250000 35.5000000, 135.4250000 35.5041667, 135.4187500 35.5041667, 135.4187500 35.5000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral