メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.375867584343 43.7670929593692, 142.376177428623 43.7676619971161, 142.374636088949 43.7680835059191, 142.3743253046 43.7675521577044, 142.374042597136 43.7670062039595, 142.375571851378 43.7665645691855, 142.375867584343 43.7670929593692)) ^^http://www.opengis.net/ont/geosparql#wktLiteral