メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.392758331959 44.1775425942654, 142.393519789335 44.1776600943533, 142.393216580612 44.178600496634, 142.392461189739 44.178476800213, 142.391575263495 44.1783317070294, 142.391873387243 44.1773985928644, 142.392758331959 44.1775425942654)) ^^http://www.opengis.net/ont/geosparql#wktLiteral