メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.875510413875 43.0132128282282, 142.875065727957 43.0129301378642, 142.874505579209 43.0125782378347, 142.875432533512 43.0117584927801, 142.875940378956 43.0120610215618, 142.876322936536 43.0122942543054, 142.87644866948 43.012402226125, 142.875510413875 43.0132128282282)) ^^http://www.opengis.net/ont/geosparql#wktLiteral