メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.594916577702 43.0294167468285, 141.594821964574 43.0295157249407, 141.594190703648 43.0301834268327, 141.592208059384 43.0291942551259, 141.594149110099 43.0271265944433, 141.59445490414 43.0272793453361, 141.594880613774 43.0274915060072, 141.596134278359 43.0281274234412, 141.595160235417 43.0291617110094, 141.594916577702 43.0294167468285)) ^^http://www.opengis.net/ont/geosparql#wktLiteral