[galaxy-user] About adding tools

Hi, I'm looking at how to add tools to galaxy. Is there any info on what the tool.xml can have within it (dtd or documentation or something)? Another thing is the command line. Is it possible to use optional command line switches that don't have values. Eg. grep has option '-i' which means ingore case (and if not given it is case sensitive). Regards, -- Henrikki Almusa