Generates 2d ISO/IEC 16022 barcodes (data matrix/semacode)

 The program generates a 2d datamatrix/semacode barcode from a
 parameter or from a file and produces output in various formats (png,
 eps, ascii-art).
 .
 http://www.semapedia.org/ for example uses semacode tags to create
 real-world "links" to wikipedia articles.