I came across Ian Yang's [[http://www.emacswiki.org/emacs/org-export-blocks-format-plantuml.el][org-export-blocks-format-plantuml]] a few days ago, which brought me in front of the
great software [[http://plantuml.sourceforge.net/][Plantuml]]. It is an open-source tool in java that allows to quickly write:
    - sequence diagram,
    - use case diagram,
    - class diagram,
    - activity diagram,
    - component diagram,
    - state diagram
    - object diagram

using a simple and intuitive language.

Although Ian Yang's code has incorporated plantuml in org-mode by =#+BEGIN_UML= and =#+END_UML=, I think it
should be a good idea to introduce the plantuml as a new language into org-babel.

Here is the "ob-plantuml.el":