Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch


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Computational Linguistics Journal (1993)

What would be ideal of course would be to have either usage separately, both usages together, or "translation" from one "language" to the other. As for prefixes, the rules are weird and wonderful, often causing problems to native speakers. To have machine-explicit rules for all cases would clearly be a boon, especially to foreign learners. Our solutions were governed by the lacunas in existing systems, by difficulties in taking the existing systems apart, but also by a desire to emphasise this rule-based aspect of language-learning. It is reasonable to hope that a big dictionary , words could cope with relatively rare prefixes like im- or ante-.

We are not aware of any satisfactory solution to this problem The problem of irregular verbs was solved by explicitly including all forms, e. The biggest obstacle encountered was that of morphological endings like -s , -ly , -er , -est , -ing and -ed. This general problem of suffixes is clearly finite, for each English word has at most ten or fifteen forms, and one solution is the sledgehammer one of listing all forms explicitly. Unfortunately, this was not the solution adopted by dictionaries accessible to us, undoubtedly for reasons of data compression.

As regards -ing and -ed , the general solution forms what has been called "junction analysis". Words ending with -eing are usually incorrect, with exceptions however like seeing and shoeing. The most efficient solution was to list the cases where the infinitive ending simply receives the suffix -ing , from agreeing through to whingeing.


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Then any other string xxxing was well-formed if xxxe was an infinitive. But words like thing are also well-formed. We used a wildcard search on an existing dictionary, and hence listed all words except verbs Similar methods were used to deal with double consonant problems, both in cases like hopping and hoping 8 and in the past-tense forms in -ed.

The distinction between rodeos and potatoes could clearly only be treated by an exhaustive listing. Terminal -x , -ch and -y also required explicit rules and sub-rules. Users are impressed if errors like comming or carryed are detected within free input and corrected with reference to the particular word.

Dik, S. C. (Simon C.)

The way was then open for parsing the sentence. The choice here was between top-down and bottom-up techniques, with top-down ones seeming preferable for ease of writing and speed of implementation. What we sought was a grammar as a collection of "rewrite rules" specifying which sequences of words are syntactically acceptable.

One sort is "Context-Free Grammar" see Figure 1. Very briefly, in CFG the individual words are specified as "terminals"; the Chomskian rewrite rules successively break down the sentence--in the very simple case shown here--into a noun phrase and a verb phrase, and eventually into determiners, nouns, verbs, etc. The left-hand side of each rule consists of exactly one term. The tree diagram with the "leaves" as terminals shows clearly the underlying logical structure of the sentence; and is therefore especially appropriate for recursive forms like "The key of the door of the house that Jack built But CFG is "context-free": it is difficult for contextual information to be taken into account.

In particular, number arguments singular and plural , agreements and tenses cannot easily be integrated. Fortunately, there exist a category of grammars which retain the three desirable characteristics, while integrating contextual information and reproducing the essential structure of Prolog: Definite Clause Grammar.

We would claim that DCG is especially well-organised, readable and concise. Two details confirm this impression. Unlike standard Prolog programs, DCG does not require "arguments"; and its treatment of recursion is particularly elegant. Thus the way of coping with an indefinite number of preceding adjectives is simply to have the clause "adjective" invoke itself until no further adjectives are found.

DCG can, more generally, not only provide a description of some of the basic grammar of English, but it is, above all, extremely powerful in use since it is an executable program of Prolog. It is difficult to overemphasise the practical advantages of this additional simplification to what is already a user-friendly language.

The programmer can think in familiar terms of the Chomskian diagrams, convert this to grammatical forms like those in Program B, and his work is finished. The system directly implements the program by converting it successively to standard Prolog and machine code.

Systemic Bibliography

In sum, Definite Clause Grammar formalism provides for three important linguistic mechanisms:. As a simple example of the second facility of contextual information, consider the two ungrammatical sentences:. In a similar way, further number arguments or other agreements can be "sent down" the sentence by specifying the appropriate logical arguments.

The third facility, of allowing general conditions, enables new lexical items to be added, not singly, which would be very tedious, but by specifying their shared information plurality, etc.

Simon Dik > Compare Discount Book Prices & Save up to 90% > enhifiter.tk

Dealing with word groups With the aid of the powerful tools provided by DCG , quite extensive numbers of syntactical features were identified by our program. The present section describes the ways in which certain codifiable features of English word groups of the highest frequency were implemented. After dealing with one clause, the program clearly needs to know when to begin its parsing again, that is when a new clause is beginning.

GF: A Multilingual Grammar Formalism

We defined an end-of-clause marker to be connectors like but , although , etc. Clearly this heuristic requires a great deal of refinement; but it was found to work in practice in nearly all students' replies. Let us--continuing our gross simplification--assume the basic sentence to be defined as a noun phrase NP followed by a verb phrase VP.

The NP itself can be composed of different items: either nouns with any number of adjectives and with or without articles or subject pronouns, or proper nouns with or without articles. The rules governing the different possibilities are distinctly messy to express, but the state transition diagram below neatly summarises most of them:. After the state S 0 beginning of sentence , a possessive pronoun, for instance, will be followed by zero or any number of adjectives, then by a noun, before reaching the end state q E.

In most international industries, English is the main language of communication for technical documents. These documents are designed to be as unambiguous as possible for their users. For international industries based in non-English speaking countries, the professionals in charge of writing requirements are often non-native speakers of English, who rarely receive adequate training in the use of English for this task.

As a result, requirements can contain a relatively large diversity of lexical and grammatical errors, which are not eliminated by the use of guidelines from controlled languages. This article investigates the distribution of errors in a corpus of requirements written in English by native speakers of French.

Errors are defined on the basis of grammaticality and acceptability principles, and classified using comparable categories. Results show a high proportion of errors in the Noun Phrase, notably through modifier stacking, and errors consistent with simplification strategies. Athelstan best-selling Windows concordance program over the three years since the original 1. A good choice for concordance novices and occasional users. Also for this older version there is a demo freely available. It assigns to each token in a text its lemma as well as all its possible morphological analysis.

The rest of the modules will make use of that output so as to accomplish disambiguation and identify lexical units. The output is given in text-format but they are currently working to give it in SGML format. Morphy, by Wolfgang Lezius, presents a German morphology and tagger in one package. Morphy runs under 1.

Teaching Functional Grammar

The Morpholgy comprises Morphy 1. Although it have been developed to analyze Japanese sentences, you can also use it for other languages.


  1. Dik, S. C. (Simon C.).
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  6. Unfortunately only the parser is provide, so you must prepare the grammar and the dictionary to analyze sentences. The basic package includes MSLR parser and related software with the following characteristics: performs simultaneous analysis of syntax and morphological form; allows input of limitation specifications inside brackets to improve results of analysis; can handle Probabilistic Generalized LR Model.

    MSLR parser only works on Unix. It has some of the functionality of the GNU recode tool, but it is based on different principles and is oriented towards SGML text manipulation. ISO is used internally as a pivot in the character translation process. Conversely, MtRecode understands SGML entities in the input and can recode them into characters of the target character sets, if they exist.

    MtRecode used to be freely downloadable directly from this page , but "has been disrupted because of technical problems. Contact the Multext mailbox or Claude de Loupy. Multext is developing a series of tools for accessing and manipulating corpora, including corpora encoded in SGML, and for accomplishing a series of corpus annotation tasks, including token and sentence boundary recognition, morphosyntactic tagging, parallel text alignment, and prosody markup. Annotation results may also be generated in SGML format.

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    All Multext tools will ultimately follow the software specifications and data architecture developed within the project. However, the tools are in various stages of development and, in their current state, conform to the Multext specifications to varying degrees. Upon completion, all tools will be publicly available for non-commercial, non-military use; at present, only some tools are publicly available and all of them exist in test versions only. Contact: Jean Veronis.

    podustchobarbmy.ml Multiconcord is a Windows-based Multilingual Parallel Concordancer for classroom use developed at the University of Birmingham under Lingua project. What is distinctive about the work at Birmingham is that the alignment at sentence level is made 'on the fly' when a concordance is requested: and that while most other work in this area has sought to elaborate the methods proposed by Gale and Church in order to achieve greater accuracy, the Birmingham approach has been to simplify those methods.

    The other distinctive feature of the Lingua project, in fact, is that its primary focus is practical: our primary aim has not been to invent new methods of test alignment though that has been an incidental spin-off , but to develop a working program and a methodology for teachers and students to exploit the program in language-learning. Users should be able their add their own pairs of texts to the corpus, using simple and easily-learned mark-up conventions based on SGML.

    Downloadable parallel texts for Multiconcord without restrictions on distribution are available without extra charge from the Parallel Texts Library.

    Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch
    Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch
    Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch
    Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch
    Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch
    Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch
    Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch Functional Grammar in Prolog: An Integrated Implementation for English, French, and Dutch

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