メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.380184336943 43.7499016994872, 142.378769386958 43.750317152337, 142.378642985384 43.7499406693614, 142.378585453432 43.7497420926508, 142.378400744663 43.7496081781701, 142.379992458876 43.7489642322798, 142.3799973275 43.7490057697978, 142.380086175672 43.7494010512755, 142.380184336943 43.7499016994872)) ^^http://www.opengis.net/ont/geosparql#wktLiteral