メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.394503249709 44.1744462018935, 142.39366161319 44.1743108589254, 142.393334307498 44.1741658890009, 142.392892704256 44.1740946449824, 142.393217360791 44.1730451153986, 142.394843263483 44.1732958678603, 142.394503249709 44.1744462018935)) ^^http://www.opengis.net/ont/geosparql#wktLiteral