メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9125000 35.8625000, 137.9187500 35.8625000, 137.9187500 35.8666667, 137.9125000 35.8666667, 137.9125000 35.8625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral