メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7187500 34.3416667, 135.7250000 34.3416667, 135.7250000 34.3458334, 135.7187500 34.3458334, 135.7187500 34.3416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral