メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.3937500 35.3291667, 136.4000000 35.3291667, 136.4000000 35.3333333, 136.3937500 35.3333333, 136.3937500 35.3291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral