メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.538717901571 42.9630262844377, 141.53925425845 42.9630183626059, 141.539247356627 42.9634522659759, 141.53926915742 42.9639009773961, 141.539286873213 42.9643133007059, 141.539290643298 42.9647685106146, 141.539332770808 42.9652025075468, 141.538263276227 42.9652515665838, 141.538239580608 42.9647851200571, 141.537675791836 42.9647996896607, 141.537639872959 42.9635034634791, 141.537614286674 42.9630644344245, 141.538181415063 42.9630454560237, 141.538717901571 42.9630262844377)) ^^http://www.opengis.net/ont/geosparql#wktLiteral