メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.37242069099 43.0744759679656, 141.372732207583 43.0745154888759, 141.372589524774 43.0750820228425, 141.372448653274 43.0756357010393, 141.372135840725 43.0755990538443, 141.371490614428 43.0755079514612, 141.371631957749 43.0749487928483, 141.371640503284 43.0748945636926, 141.371770633738 43.0743880652372, 141.37242069099 43.0744759679656)) ^^http://www.opengis.net/ont/geosparql#wktLiteral