added some comments
added some comments

svn path=/trunk/StrategoXT/; revision=976

Apanatshka/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,metaborg/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt,metaborg/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt,metaborg/strategoxt