Download Arabic Computational Morphology: Knowledge-based and by Abdelhadi Soudi, Antal van den Bosch, Günter Neumann PDF

By Abdelhadi Soudi, Antal van den Bosch, Günter Neumann

The morphology of Arabic poses designated demanding situations to computational common language processing structures. the outstanding measure of ambiguity within the writing process, the wealthy morphology, and the hugely advanced observe formation strategy of roots and styles all give a contribution to creating computational ways to Arabic very demanding. certainly many computational linguists internationally have taken up this problem through the years, and lots of of the researchers with a music list during this learn region have contributed to this ebook.

The book’s subtitle goals to mirror that generally assorted computational techniques to the Arabic morphological process were proposed. those debts fall into major paradigms: the knowledge-based and the empirical. because morphological wisdom performs a vital function in any higher-level realizing and processing of Arabic textual content, the ebook additionally contains a half at the function of Arabic morphology in better functions, i.e. info Retrieval (IR) and computer Translation (MT).

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Additional resources for Arabic Computational Morphology: Knowledge-based and Empirical Methods

Example text

8). In the Unicode character set this word-final undotted yƗ’ is represented by U+06CC (ARABIC LETTER FARSI YEH). The Unicode standard (2003, p. 59) states that this letter “yeh” is written with dots in initial and medial positions, in which case it maps to Arabic yƗ’ (U+064A), and that in final and separate positions it maps to alif maqSnjra (U+0649). Systems using 8-bit encoding schemes have implemented this undotted yƗ’ in two different ways, which we will refer to by their codepages: Mac Arabic and Windows 1256 (both of which antedated the Unicode standard).

Issues in Arabic Morphological Analysis 35 An example of an archaic lexical item that was used in MSA context not too long ago and disseminated widely in the media is the word ϯΰϴο Dyzý, which is not found in any dictionary of Modern Standard Arabic. This word comes from Qur. ” This verse was alluded to in a taped speech by Usama bin Laden which was broadcast widely by the media in November 2002. , Qur’an and Hadith), and that it is advisable to extend the lexical coverage of morphological analysis to such texts, especially since corpusbased lexicography is able to detect the usage and frequency of these archaic lexical items.

The lexicon can be enhanced in terms of its lexical coverage, by adding new words and 36 Buckwalter new meanings to old words, and also by increasing the level of grammatical detail that is described. We are familiar with two major different types of morphological analysis lexicons: the Xerox lexicon (Beesley, 2001), whose entries are based on root and pattern morphemes, and our own lexicon (Buckwalter, 2004a), whose entries make use of word stems. In the argument over which method represents the correct approach to analyzing a Semitic language such as Arabic, it should be mentioned that although root and pattern morphology is pervasive in the language, approximately seven percent of the entries in the lexicon contain no discernable pattern morpheme (and thus no discernable root morpheme, although Arabs are often capable of extracting root candidates from many non-Semitic words), and that these words must be treated with a stem-based approach.

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