メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348814038274 44.4848320908808, 142.347955190278 44.4846188688286, 142.348364993054 44.4837566591895, 142.349215860498 44.4839868282479, 142.348814038274 44.4848320908808)) ^^http://www.opengis.net/ont/geosparql#wktLiteral