メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.378937455037 43.7806802400818, 142.378196932132 43.7809098907023, 142.377401079426 43.7811389446946, 142.376813569957 43.7800874260795, 142.377585642694 43.7798242947281, 142.378346562682 43.7795958748385, 142.37913031186 43.7793522879485, 142.37972361931 43.7804540684131, 142.378937455037 43.7806802400818)) ^^http://www.opengis.net/ont/geosparql#wktLiteral