メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.000204123164 42.5363864198824, 141.999536364725 42.5366630837332, 141.98330724636 42.5272267104567, 141.989947087512 42.5249286720528, 142.006207067399 42.5339003386746, 142.00607736987 42.5339539417412, 142.005992350339 42.5339892116355, 142.005744696157 42.5340916604573, 142.003654195665 42.5349567181784, 142.001947101351 42.5356641635389, 142.000204123164 42.5363864198824)) ^^http://www.opengis.net/ont/geosparql#wktLiteral