メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.135703616353 42.7019183304508, 143.134446694609 42.702409674079, 143.133117918212 42.700633007742, 143.134436098958 42.700145986621, 143.135703616353 42.7019183304508)) ^^http://www.opengis.net/ont/geosparql#wktLiteral