doc/org.eclipse.epsilon.book/listings/OCLFormat.tex

\lstdefinelanguage{OCL2}{
morekeywords={context, package,endpackage,end,inv,and,or,xor,implies,if,else,then,endif,let,def},
sensitive=true,
morecomment=[l]{--},
%morecomment=[s]{/*}{*/},
morestring=[b]',
showstringspaces=false
}