メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349334621731 43.7760840040342, 142.349592033129 43.7765144392286, 142.348171667276 43.7769155076499, 142.347959075386 43.7764835875081, 142.347722665893 43.7760669832113, 142.349114211394 43.7756602320437, 142.349334621731 43.7760840040342)) ^^http://www.opengis.net/ont/geosparql#wktLiteral