メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.033922797861 43.5685024748059, 142.033056415684 43.5684365831651, 142.03217146424 43.5683701560584, 142.032245869815 43.5677784000825, 142.033117443495 43.5678579891999, 142.034019157588 43.5679325259716, 142.034014883977 43.5679578702879, 142.033922797861 43.5685024748059)) ^^http://www.opengis.net/ont/geosparql#wktLiteral