メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.044461631415 42.9166537830301, 143.042280606406 42.9165147694201, 143.042441818559 42.9153967826138, 143.043104071116 42.9154448148135, 143.043848635966 42.9155055657927, 143.044595741821 42.915566646318, 143.044461631415 42.9166537830301)) ^^http://www.opengis.net/ont/geosparql#wktLiteral