Hello World! in Arden Syntax

The following shows how to output a Hello World! message on standard output using Arden Syntax.
File hello_world.mlm:

/* This is a comment. */
maintenance: /* This section covers general information about this Medical Logic Module (MLM) */
  title:  hello world;;
  mlmname:  hello_world;;
  arden:  Version 2.1;;  version:  1.70;;
  institution:  arden2bytecode authors;;
  author:  Hannes Flicka;;
  specialist:  ;;
  date:  2011-09-08;;
  validation:  testing;;

library: /* This section contains additional metadata such that you can find this MLM in larger databases */
  purpose:  demonstration of arden syntax;;
  explanation:  ;;
  keywords:  hello world;;
  citations:  ;;

knowledge: /* This section contains - among other stuff - the actual program logic. */
  type:  data-driven;;

  data:
      stdout_dest := destination
        {stdout}; /* The 'destination' statement is implementation specific. */
          /* For further information, have a look at the documentation of 
             your runtime environment. In our case, this is arden2bytecode. */
      ;;

  evoke:
      null_event;; 
  
  logic:
      conclude true;;

  action:
      write "Hello world!"
        at stdout_dest; /* The actual output. */
      ;;

  urgency:  50;;

end:

Running the Hello World example

To run the above MLM, put it in a directory where you can start the Arden2ByteCode compiler and type arden2bytecode -r hello_world.mlm on a command prompt.
The output should be:

Arden2ByteCode Compiler and Runtime Environment
Copyright 2010-2011 Daniel Grunwald, Hannes Flicka

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License.

"Hello world!"
There was no return value.

Now that you have a starting point for working with Arden Syntax, you can experiment with the Arden Syntax (Introduction to Arden Syntax) or try out different command line parameters (Arden2ByteCode command line reference).