メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.17764298947 39.1912017338983, 141.177402916948 39.1910721776112, 141.178140178526 39.1903811387684, 141.178596280718 39.1906204012587, 141.178496981424 39.1907864342709, 141.178083705365 39.191110553312, 141.177852113993 39.1910090533213, 141.17764298947 39.1912017338983)) ^^http://www.opengis.net/ont/geosparql#wktLiteral