3. The system of claim 1 further comprises a grammar optimizer configured to receive the extraction specification which is incomplete in relation to the context-free grammar and operable to translate the extraction specification to a complete extraction specification using the context-free grammar.
3. The system of claim 1 further comprises a grammar optimizer configured to receive the extraction specification which is incomplete in relation to the context-free grammar and operable to translate the extraction specification to a complete extraction specification using the context-free grammar. 4. The system of claim 3 wherein the grammar optimizer transforms the complete extraction specification to an equivalent regular grammar.