メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.708589897068 44.3716623462165, 141.707510627043 44.3723711118465, 141.706387796971 44.3715128369842, 141.706427342756 44.3714873967015, 141.707500608814 44.3707967552708, 141.708589897068 44.3716623462165)) ^^http://www.opengis.net/ont/geosparql#wktLiteral