メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.056913099655 42.9150277159275, 143.058571857562 42.9151613296859, 143.058502899224 42.9156466881323, 143.058455680968 42.9159872896768, 143.058399999866 42.9165003352367, 143.055944044998 42.916339059487, 143.056048825239 42.9154803391595, 143.056121425197 42.9149645032473, 143.056913099655 42.9150277159275)) ^^http://www.opengis.net/ont/geosparql#wktLiteral