メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.37786437228 43.7549819900806, 142.378196343199 43.7555730597678, 142.37751770331 43.7557565260734, 142.376731054571 43.75598405892, 142.376587090615 43.7557430674562, 142.37640792512 43.7554003762692, 142.37613932932 43.7549096338017, 142.377612823631 43.7544829859671, 142.37786437228 43.7549819900806)) ^^http://www.opengis.net/ont/geosparql#wktLiteral