メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.620172237299 43.3059995340609, 144.613927360048 43.3074501130959, 144.613085093076 43.3054968603838, 144.619256352565 43.3040595296182, 144.620172237299 43.3059995340609)) ^^http://www.opengis.net/ont/geosparql#wktLiteral