メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.749242340209 43.1595441108089, 141.749836507176 43.1596868860064, 141.74907076089 43.1604806543377, 141.748908329454 43.1606487346209, 141.748255177979 43.1613575365752, 141.747753068482 43.1610932066321, 141.747361539537 43.1608405442142, 141.747794314129 43.1603786901844, 141.747984868921 43.1601727562022, 141.748689309724 43.1594112186711, 141.749242340209 43.1595441108089)) ^^http://www.opengis.net/ont/geosparql#wktLiteral