\include allows to include another Doodle file inside the current one. It can be seen as a replacement of the operator by the content of the file given in parameter. The file to be inserted is given as a string, so it can contain space characters. There is no restriction concerning the place of this operator, it can be found anywhere in the file.
\include("french_operators.doo");
\include(STRING);
STRING Description : Indicates the inserted file name. Type : String. Allowed values : Any well formed string (between two double-quotes (")).