メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.5937500 35.2166667, 136.6000000 35.2166667, 136.6000000 35.2208334, 136.5937500 35.2208334, 136.5937500 35.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral