メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.392587187839 44.1850134070898, 142.39147683024 44.1848343136242, 142.3919062424 44.1835151585914, 142.393007656479 44.1836986191564, 142.392813492498 44.1843057778433, 142.392587187839 44.1850134070898)) ^^http://www.opengis.net/ont/geosparql#wktLiteral