メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.568655518579 42.9821298666259, 141.569324431256 42.9820731463951, 141.569372262836 42.9827438344758, 141.569409888242 42.9832716176917, 141.568714486903 42.9832969531656, 141.567954024166 42.9833108555599, 141.567348962201 42.9833268745157, 141.566731574694 42.9832447032252, 141.566795308991 42.9830469585159, 141.566818271897 42.9829629780674, 141.567031249194 42.9821373564505, 141.567592643964 42.9821407018461, 141.567786490076 42.9821394652914, 141.568655518579 42.9821298666259)) ^^http://www.opengis.net/ont/geosparql#wktLiteral