メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.77524662011 43.1976735255294, 141.774099630983 43.1988834806906, 141.774095755435 43.1988874029879, 141.773189839014 43.1984225726918, 141.773746216635 43.1978289919472, 141.774527256528 43.1970023595866, 141.775048362874 43.1972811186962, 141.77524662011 43.1976735255294)) ^^http://www.opengis.net/ont/geosparql#wktLiteral