メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.903477799498 43.4844058692349, 141.902920190737 43.4844814750444, 141.902874058988 43.4843374862687, 141.902722575147 43.4837427499299, 141.903234920248 43.4836645125227, 141.903459546568 43.4843468125702, 141.903477799498 43.4844058692349)) ^^http://www.opengis.net/ont/geosparql#wktLiteral