メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.383900769083 44.1899114568337, 142.38072640634 44.1893791288049, 142.380486100543 44.1893409916514, 142.381239675505 44.1868823531452, 142.381275149615 44.1868882727215, 142.383488337753 44.1872575889957, 142.384667927752 44.187432001791, 142.383900769083 44.1899114568337)) ^^http://www.opengis.net/ont/geosparql#wktLiteral