メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.045829009471 42.9068735722179, 143.046564417497 42.9069257859384, 143.046412203186 42.908147545868, 143.045667013872 42.9080945543487, 143.044848742689 42.9080430467646, 143.045000196239 42.9068192558227, 143.045829009471 42.9068735722179)) ^^http://www.opengis.net/ont/geosparql#wktLiteral