メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396743978591 44.1849231018597, 142.394741668235 44.1846080802339, 142.394944993346 44.1839642011854, 142.39616656069 44.1841543520722, 142.39693355647 44.1842938963444, 142.396743978591 44.1849231018597)) ^^http://www.opengis.net/ont/geosparql#wktLiteral