メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907039292014 43.4911553701294, 141.907003207274 43.4911608181678, 141.906703889499 43.4899805844007, 141.907631343238 43.4898353871397, 141.907988292842 43.4910121351158, 141.907039292014 43.4911553701294)) ^^http://www.opengis.net/ont/geosparql#wktLiteral