メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7437500 26.2666667, 127.7500000 26.2666667, 127.7500000 26.2708334, 127.7437500 26.2708334, 127.7437500 26.2666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral