メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.583897637297 43.3342620285406, 145.583530317192 43.3347386770326, 145.582356620851 43.3342261073176, 145.582727138727 43.333751480504, 145.583118392966 43.3332826464574, 145.58427875217 43.3337700686626, 145.583897637297 43.3342620285406)) ^^http://www.opengis.net/ont/geosparql#wktLiteral