メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.127695164319 43.5424136145988, 142.12523642112 43.542246880965, 142.123865614999 43.5421176353465, 142.123941163158 43.5416095922853, 142.127769288147 43.5418423492056, 142.127695164319 43.5424136145988)) ^^http://www.opengis.net/ont/geosparql#wktLiteral