メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.346927131248 44.4820815669993, 142.346904752214 44.4820759250359, 142.345803628628 44.4818184909824, 142.346152365808 44.4810860334386, 142.347270227495 44.4813488973886, 142.346927131248 44.4820815669993)) ^^http://www.opengis.net/ont/geosparql#wktLiteral