メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.345646262409 43.0636344903943, 141.346444632267 43.0637429217729, 141.346285785403 43.0643438983805, 141.346131212951 43.0649540515264, 141.345155231474 43.0648162904115, 141.344872220814 43.0647736814848, 141.344638595834 43.0647385657168, 141.344613648178 43.0644654184487, 141.344639580291 43.064391497175, 141.344734593909 43.0641206367215, 141.344997442889 43.0635449605266, 141.345646262409 43.0636344903943)) ^^http://www.opengis.net/ont/geosparql#wktLiteral