By Striegnitz K., et al.
The identify Computational Linguistics already means that this displine includes similar items of study: normal language (NL) is studied and operational equipment are built. either fields are investigated of their personal correct and divide into quite a few subject matters. This path introduces quite a few NL phenomena including acceptable implementations within the programming language Prolog. the subjects handled are between others Morphology, Finite nation strategies, Syntax, Context unfastened Grammars, Parsing, and Semantics development.
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6 Chapter 3. 5. We proceed again by giving further clauses of start/2, trans/4 and final/2. Remember that we gave the automaton for the union of two regular languages a brand new start state. This is encoded in the clause we add to start/2: start((_;_),start). Assume that we are building a union-automaton from a1 and a2. 5, our union-automaton should contain jump arcs from the new start state to (copies of) the start states of a1 and a2. We add the following clauses to trans/4 for this purpose: trans((A1;_),start,1/S1,’#’):start(A1,S1).
Traverse(A,L1:L2,[L1|RestTape1],RestTape1,[L2|RestTape2],RestTape2). Finally, we define the following driver predicate testtrans/3. It can be called with both arguements instantiated, only one of them instantiated, or both uninstantiated – depending on which mode we want to use the transducer in. testtrans(A,Tape1,Tape2) :start(Node), transduce(A,Node,Tape1,Tape2). We can use this program to transduce as to bs with our first transducer. To be able to use the second transducer, the a doubler, as well, we need a program that can handle transitions involving jumps.
This, for instance, is a transducer that translates as into bs: a:b 1 a:b at the arc means that in this transition the transducer reads a from the first tape and writes b onto the second. Transducers can, however, be used in other modes than the translation mode as well: in the generation mode transducers write on both tapes and in the recognition mode they read from both tapes. e. a:b can not only be read as “read a from the first tape and write b onto the second tape”, but also as “read b from the second tape and write a onto the first tape”.