メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.34642625735 43.7683700645145, 142.346275605995 43.7683087493245, 142.345460434202 43.7682269576178, 142.345567791007 43.766530160565, 142.346057082217 43.7669279714928, 142.347225247997 43.7671282109105, 142.347265041974 43.7672345370219, 142.347333555238 43.767417541076, 142.34642625735 43.7683700645145)) ^^http://www.opengis.net/ont/geosparql#wktLiteral