メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.390207713075 43.6875886895485, 142.389449937768 43.6889135654315, 142.38814230689 43.6885428373284, 142.38774097613 43.6884207059034, 142.388523797669 43.687072220961, 142.389113464163 43.6861159016391, 142.390769765459 43.6866059166742, 142.390207713075 43.6875886895485)) ^^http://www.opengis.net/ont/geosparql#wktLiteral