メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.445576496766 43.0536545413248, 141.446054855689 43.0551197980915, 141.446129406483 43.0553633850155, 141.444364108008 43.0556732945151, 141.444270261998 43.0554279531836, 141.443939258034 43.0543685518487, 141.44380769045 43.0539648412386, 141.443644066278 43.0534642710265, 141.44542999037 43.0531713939846, 141.445576496766 43.0536545413248)) ^^http://www.opengis.net/ont/geosparql#wktLiteral