Well that depends, if you somehow manage to link well across different domains it can be done. Take a look at the Lowlands project from Copenhagen University (h

Well that depends, if you somehow manage to link well across different domains it can be done. Take a look at the Lowlands project from Copenhagen University (http://lowlands.ku.dk http://lowlands.ku.dk), which deals specifically with cross domain adaptation. You are right that reasonable domains are required though.