メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7937500 35.0500000, 135.8000000 35.0500000, 135.8000000 35.0541667, 135.7937500 35.0541667, 135.7937500 35.0500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral