メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.7937500 42.7916667, 143.8000000 42.7916667, 143.8000000 42.7958334, 143.7937500 42.7958334, 143.7937500 42.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral