メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.390845108556 44.180706255941, 142.389701172361 44.1805652267731, 142.390163658995 44.1790426293801, 142.391297690789 44.1792313420654, 142.390845108556 44.180706255941)) ^^http://www.opengis.net/ont/geosparql#wktLiteral