メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.101542180012 43.8248821639049, 144.099452814967 43.8255186562742, 144.098873197799 43.8244822866016, 144.100924697363 43.8238535219856, 144.101542180012 43.8248821639049)) ^^http://www.opengis.net/ont/geosparql#wktLiteral