メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.407955528144 43.7924923304826, 142.409006089921 43.7931577160678, 142.407784230309 43.7941669856533, 142.406746401759 43.7935166397041, 142.405723696804 43.7928678273555, 142.405707651201 43.7928576875368, 142.406524302469 43.7921811565783, 142.406919482232 43.7918489980446, 142.407272413009 43.792077660592, 142.407955528144 43.7924923304826)) ^^http://www.opengis.net/ont/geosparql#wktLiteral