メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.350634428506 44.4882023379703, 142.349248855718 44.4878630272698, 142.349479687215 44.4873830850329, 142.349505588002 44.4873292370646, 142.350891225266 44.4876628835569, 142.350855638073 44.4877376582005, 142.350634428506 44.4882023379703)) ^^http://www.opengis.net/ont/geosparql#wktLiteral