メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.376766767346 43.7655904350972, 142.377063480853 43.7661275767881, 142.375571851378 43.7665645691855, 142.375276070746 43.7660158537657, 142.374980347991 43.7654874613246, 142.376475423549 43.7650494019462, 142.376607471776 43.7653183245789, 142.376766767346 43.7655904350972)) ^^http://www.opengis.net/ont/geosparql#wktLiteral