Re: RDF ontology for describing reusable software components

See please ontology developed in UBOT project of LockheedMartin
UML representation here http://ubot.lockheedmartin.com/ubot/lessons/images/sw_artifact.gif
They have tools for UML to DAML conversion
Think it maybe high relevant for you 
because it allows to describe 
 relations between software components to reason  if you need to install something what you need to install before, etc
 and it allows to describe a semantic (really very weakly now) of elements to reason about satisfaction of user needs, re-usability, etc

sorry for late answering, I was offline

Best regards
Andrei Lopatenko

Information Management Group
Department of Computer Science
University of Manchester
 
A chairman of CERIF Task Group
euroCRIS conc
http://www.cs.man.ac.uk/~lopatena/