メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3250000 28.1541667, 129.3312500 28.1541667, 129.3312500 28.1583333, 129.3250000 28.1583333, 129.3250000 28.1541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral