メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.822601144962 43.0811794712269, 142.821866300464 43.0829452790524, 142.82142503717 43.0827245377073, 142.819630891651 43.0821316621703, 142.818738966869 43.0819986702784, 142.819755964955 43.0795904219381, 142.82071164374 43.0798041799607, 142.821896399395 43.0800693158794, 142.822260985757 43.0801509039642, 142.821884702985 43.081024462451, 142.822601144962 43.0811794712269)) ^^http://www.opengis.net/ont/geosparql#wktLiteral