Second, the treebank-and machine-learning-based LFG resources require automatic mapping to relate f-structure output of the treebank-based parsing systems to the representation format in the PARC 700 and CBS 500 Dependency Banks.
these mappings are partial and lossy: they do not cover all of the systematic differences between f-structure and dependency bank representations and introduce a certain amount of error in what they are designed to capture, that is they both overand undergeneralize, again adversely affecting scores.