メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.341800203954 43.0557678118083, 141.341654013884 43.0563478545376, 141.341512135637 43.0569280023398, 141.340116503715 43.0567321496724, 141.340193412246 43.0564085425382, 141.340255383578 43.0561481126494, 141.340410049426 43.0555858628668, 141.341800203954 43.0557678118083)) ^^http://www.opengis.net/ont/geosparql#wktLiteral