メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7187500 26.4125000, 127.7250000 26.4125000, 127.7250000 26.4166667, 127.7187500 26.4166667, 127.7187500 26.4125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral