メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907073960105 43.4970747756089, 141.906340800182 43.4971942780954, 141.906178745766 43.4966993633361, 141.905971333253 43.4960659784454, 141.905996787256 43.4960618708713, 141.906773616198 43.4959432048148, 141.907073960105 43.4970747756089)) ^^http://www.opengis.net/ont/geosparql#wktLiteral