メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347830374294 44.4801700812648, 142.347222741242 44.4800307149747, 142.347330787957 44.4797882193937, 142.346828585346 44.4796657060884, 142.346866743767 44.4795855877488, 142.347087448942 44.4791220042489, 142.347636022381 44.4792526322993, 142.347696913611 44.4792679430244, 142.348199083057 44.4793941083124, 142.347830374294 44.4801700812648)) ^^http://www.opengis.net/ont/geosparql#wktLiteral