メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.7250000 43.4208334, 143.7312500 43.4208334, 143.7312500 43.4250000, 143.7250000 43.4250000, 143.7250000 43.4208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral