メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9125000 32.7916667, 129.9187500 32.7916667, 129.9187500 32.7958334, 129.9125000 32.7958334, 129.9125000 32.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral