メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.352234960477 43.7752480846372, 142.352242627342 43.7752625459798, 142.352451314683 43.7756709377625, 142.351013628908 43.7760992519917, 142.350779321813 43.7756721579434, 142.350542736179 43.7752500923536, 142.352012086913 43.7748274871081, 142.352234960477 43.7752480846372)) ^^http://www.opengis.net/ont/geosparql#wktLiteral