メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.377680762072 43.7703856334294, 142.377982936388 43.7709228757938, 142.376467998682 43.7713647217192, 142.37618732068 43.7708235664096, 142.375870652931 43.7702922771474, 142.377382639413 43.7698411948124, 142.377680762072 43.7703856334294)) ^^http://www.opengis.net/ont/geosparql#wktLiteral