Multifocal This cabal package can be installed with: $ cabal install multifocal For a manual install, execute: $ runhaskell Setup.lhs configure $ runhaskell Setup.lhs build $ runhaskell Setup.lhs install For an example, try running the following steps: 1) generate a target XML Schema file and an optimized lens executable from the source XML Schema file imdb.xsd according to the transformation imdb.2lt. $ multifocal -i examples/imdb.xsd -t examples/imdb.2lt -o examples/imdb2.xsd -c examples/Imdb.hs -e 2) compile the resulting file $ ghc --make examples/Imdb.hs -o imdb 3) Migrate a source XML document into a target XML document $ ./imdb -s examples/imdb.xml -f -o examples/imdb2.xml 4) Translate an updated target XML document back to the source ./imdb -s examples/imdb.xml -t examples/imdb2mod.xml -b -o examples/imdbmod.xml