To plug a function into PHABS, the users have to develop
a wrapper library which packages the functions according to
a simple interface specification. And at the same time, the
users need to submit a Plugin XML file to PHABS. The Plugin
XML file will be used by users and PHABS to get the
functions' prototype information, and to learn to how to make
a call into the Plugin functions. The main part of Plugin XML
file is parameter list, as shown in Fig.3.