メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.708593035537 44.3732472167528, 141.708032061164 44.3736022729731, 141.706957659481 44.3727350591015, 141.707510627043 44.3723711118465, 141.708593035537 44.3732472167528)) ^^http://www.opengis.net/ont/geosparql#wktLiteral