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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+(** ['a gxml] is the type for semi-structured documents. They generalize
+ XML by allowing any kind of attributes. *)
+type 'a gxml =
+ | Element of (string * 'a * 'a gxml list)
+ | PCData of string
+
+(** [xml] is a semi-structured documents where attributes are association
+ lists from string to string. *)
+type xml = (string * string) list gxml
+
+