メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.355011654537 43.7825759478025, 142.354429073423 43.7829891605473, 142.353881738139 43.7833790778208, 142.353857165086 43.7833972092649, 142.353185744043 43.7828868809966, 142.353292004668 43.7828099549127, 142.353496978915 43.7826662384654, 142.353739688584 43.7824954127113, 142.354303889786 43.7820819567495, 142.355011654537 43.7825759478025)) ^^http://www.opengis.net/ont/geosparql#wktLiteral