メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.41318871707 43.7995980985591, 142.413133748273 43.7995339911219, 142.411100697951 43.7982801717894, 142.412509787561 43.7970913787983, 142.41406492998 43.7980819923405, 142.414582861898 43.798406823932, 142.414979445823 43.7986491819679, 142.414041912617 43.7994526398952, 142.413660501471 43.7992296663032, 142.413374683364 43.7994679341651, 142.41318871707 43.7995980985591)) ^^http://www.opengis.net/ont/geosparql#wktLiteral