メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.363818911615 43.7861275872144, 142.363132903491 43.7866110258377, 142.362493110418 43.7870733190951, 142.360781007896 43.7858356235296, 142.361423879772 43.7853708400505, 142.362105779867 43.7848849180869, 142.363818911615 43.7861275872144)) ^^http://www.opengis.net/ont/geosparql#wktLiteral