メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7312500 26.2708334, 127.7375000 26.2708334, 127.7375000 26.2750000, 127.7312500 26.2750000, 127.7312500 26.2708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral