メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.750218348587 43.1963703398372, 141.749352742955 43.1973218974835, 141.749312309919 43.1972348649624, 141.749160080562 43.1968307280268, 141.749065032819 43.1964579239561, 141.748939782159 43.1957173828489, 141.750116689582 43.196318134758, 141.750218348587 43.1963703398372)) ^^http://www.opengis.net/ont/geosparql#wktLiteral