メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.75043110738 43.1974568535912, 141.749817145364 43.1981681455327, 141.749657029084 43.1979343772771, 141.749518055238 43.1976780575482, 141.749352742955 43.1973218974835, 141.750218348587 43.1963703398372, 141.751056808598 43.196801166897, 141.75043110738 43.1974568535912)) ^^http://www.opengis.net/ont/geosparql#wktLiteral