メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.568947566861 42.9780707797138, 141.569476783676 42.9781094422814, 141.56937457657 42.9788964824016, 141.568839664566 42.9788612316925, 141.56881908569 42.9788598435785, 141.56881719087 42.9788752346651, 141.568144034052 42.9788119404638, 141.567596431416 42.9787766786176, 141.567744392487 42.9785408224012, 141.567846683752 42.9783549819437, 141.568061242729 42.9779906737576, 141.568947566861 42.9780707797138)) ^^http://www.opengis.net/ont/geosparql#wktLiteral