メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7000000 26.2166667, 127.7062500 26.2166667, 127.7062500 26.2208334, 127.7000000 26.2208334, 127.7000000 26.2166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral