メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347249419021 44.4879170617578, 142.34715369097 44.4878948178941, 142.346027716691 44.4876201112996, 142.346269109862 44.4871146072681, 142.347410569493 44.4874144347731, 142.347471626877 44.4874293244377, 142.347341054602 44.4877108621474, 142.347249419021 44.4879170617578)) ^^http://www.opengis.net/ont/geosparql#wktLiteral