メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.464852491065 43.5861593286538, 142.46503113011 43.5862805124326, 142.465682534037 43.586722325452, 142.466060309482 43.5869785408944, 142.466110635453 43.5870106197005, 142.466586303614 43.587329024092, 142.466068947318 43.5877382727053, 142.465437194554 43.5882267084562, 142.464968322116 43.5879077581118, 142.464129559256 43.5873371768004, 142.463934841981 43.5872047347502, 142.463715249063 43.5870548274693, 142.463216443711 43.5867143373854, 142.463435403241 43.5865435674849, 142.464350059881 43.5858185676791, 142.464852491065 43.5861593286538)) ^^http://www.opengis.net/ont/geosparql#wktLiteral