Programming Research Group  -  University of Amsterdam  -  TR P9904


		Scaffolding for Software Renovation

			    Alex Sellink
			   Chris Verhoef


We discuss an  approach  that  explores  the use of  scaffolding  of
source code to facilitate its renovation.  We show that  scaffolding
is a useful  paradigm for software  renovation.  We designed  syntax
and   semantics   for   scaffolding,   that   enables  all  relevant
applications   of  scaffolding   of  source  code.  We  discuss  the
automatic  generation of extensions to a normal  grammar so that the
resulting  extension  grammar  can parse code with  scaffolding.  We
used the  scaffolding  paradigm  itself to implement the  generation
process,  thereby showing that our approach  towards  scaffolding is
also  useful  in   software   development.  We  discuss   real-world
applications of scaffolding  for software  renovation,  both our own
and some from others in the reengineering IT industry.