メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.75022958014 42.8998457961446, 140.749103402765 42.8999211236036, 140.749110328971 42.8999471665097, 140.747428141346 42.9000421883745, 140.747357945002 42.8991823146035, 140.749020908799 42.8990899935929, 140.749026538316 42.8991103227852, 140.750153982677 42.8990452104304, 140.75022958014 42.8998457961446)) ^^http://www.opengis.net/ont/geosparql#wktLiteral