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+-- Copyright 2013 by Till Tantau
+--
+-- This file may be distributed an/or modified
+--
+-- 1. under the LaTeX Project Public License and/or
+-- 2. under the GNU Public License
+--
+-- See the file doc/generic/pgf/licenses/LICENSE for more information
+
+-- @release $Header$
+
+
+local key = require 'pgf.gd.doc'.key
+local documentation = require 'pgf.gd.doc'.documentation
+local summary = require 'pgf.gd.doc'.summary
+local example = require 'pgf.gd.doc'.example
+
+
+
+--------------------------------------------------------------------
+key "SiftingHeuristic"
+summary "The sifting heuristic for 2-layer crossing minimization."
+--------------------------------------------------------------------
+
+
+--------------------------------------------------------------------
+key "SiftingHeuristic.strategy"
+summary "Sets a so-called ``sifting strategy''."
+documentation
+[[
+ The following values are permissible: |left_to_right|, |desc_degree|,
+ and |random|.
+]]
+--------------------------------------------------------------------