メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9437500 26.5291667, 127.9500000 26.5291667, 127.9500000 26.5333333, 127.9437500 26.5333333, 127.9437500 26.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral