メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.378808421591 42.9835348714124, 144.377913783324 42.9833740946448, 144.376308716208 42.9830829219507, 144.376487312622 42.9825012971656, 144.378119428153 42.98276615407, 144.378259571081 42.9827913947226, 144.379005926264 42.9829300347015, 144.378808421591 42.9835348714124)) ^^http://www.opengis.net/ont/geosparql#wktLiteral