メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7187500 31.8000000, 130.7250000 31.8000000, 130.7250000 31.8041667, 130.7187500 31.8041667, 130.7187500 31.8000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral