メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347464873848 44.4835131304941, 142.346379754458 44.4832195494778, 142.346904752214 44.4820759250359, 142.346927131248 44.4820815669993, 142.348015022617 44.4823552408556, 142.347464873848 44.4835131304941)) ^^http://www.opengis.net/ont/geosparql#wktLiteral