メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.044645837097 42.9204731532916, 143.044048987172 42.9204288977322, 143.043854055417 42.9204177982011, 143.044006232159 42.9192270797662, 143.044820263618 42.9192800287532, 143.044645837097 42.9204731532916)) ^^http://www.opengis.net/ont/geosparql#wktLiteral