メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39644466788 44.1858982779967, 142.396373690147 44.1861295151917, 142.394344128038 44.1857959220865, 142.394347518791 44.1857841398095, 142.394330619216 44.1857815959235, 142.394712715771 44.1846011719571, 142.394741668235 44.1846080802339, 142.396743978591 44.1849231018597, 142.396705159591 44.1850495975154, 142.39644466788 44.1858982779967)) ^^http://www.opengis.net/ont/geosparql#wktLiteral