1.1 --- a/doc/lgf.dox	Mon Jul 16 16:21:40 2018 +0200
     1.2 +++ b/doc/lgf.dox	Wed Oct 17 19:14:07 2018 +0200
     1.3 @@ -2,7 +2,7 @@
     1.4   *
     1.5   * This file is a part of LEMON, a generic C++ optimization library.
     1.6   *
     1.7 - * Copyright (C) 2003-2009
     1.8 + * Copyright (C) 2003-2013
     1.9   * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
    1.10   * (Egervary Research Group on Combinatorial Optimization, EGRES).
    1.11   *
    1.12 @@ -63,11 +63,28 @@
    1.13   3      (40,10)      10      "Third node"
    1.14  \endcode
    1.15  
    1.16 -The \c \@arcs section is very similar to the \c \@nodes section, it
    1.17 -again starts with a header line describing the names of the maps, but
    1.18 -the \c "label" map is not obligatory here. The following lines
    1.19 -describe the arcs. The first two tokens of each line are the source
    1.20 -and the target node of the arc, respectively, then come the map
    1.21 +The \e LGF files can also contain bipartite graphs, in this case a
    1.22 +\c \@red_nodes and a \c \@blue_nodes sections describe the node set of the
    1.23 +graph. If a map is in both of these sections, then it can be used as a
    1.24 +regular node map.
    1.25 +
    1.26 +\code
    1.27 + @red_nodes
    1.28 + label  only_red_map   name
    1.29 + 1      "cherry"       "John"
    1.30 + 2      "Santa Claus"  "Jack"
    1.31 + 3      "blood"        "Jason"
    1.32 + @blue_nodes
    1.33 + label  name
    1.34 + 4      "Elisabeth"
    1.35 + 5      "Eve"
    1.36 +\endcode
    1.37 +
    1.38 +The \c \@arcs section is very similar to the \c \@nodes section,
    1.39 +it again starts with a header line describing the names of the maps,
    1.40 +but the \c "label" map is not obligatory here. The following lines
    1.41 +describe the arcs. The first two tokens of each line are
    1.42 +the source and the target node of the arc, respectively, then come the map
    1.43  values. The source and target tokens must be node labels.
    1.44  
    1.45  \code