メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.7250000 43.5291667, 143.7312500 43.5291667, 143.7312500 43.5333333, 143.7250000 43.5333333, 143.7250000 43.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral