Arabic Computational Morphology: Knowledge-based and by Abdelhadi Soudi (Editor), Antal van den Bosch (Editor),

By Abdelhadi Soudi (Editor), Antal van den Bosch (Editor), Günter Neumann (Editor)

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Extra resources for Arabic Computational Morphology: Knowledge-based and Empirical Methods (Text, Speech and Language Technology)

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All textual examples that we cite come from actual corpus data. 2 Expansion of the Arabic Character Set The implementation of the Unicode character set on systems used for authoring Arabic texts for publication on the Web has dramatically expanded the set of characters available for representing Arabic electronically, and this has had an impact, both positive and negative, on the orthography of the language, which ultimately impacts morphological analysis as well. The positive impact is seen in more accurate representations of non-Arabic sounds, and in some cases this facilitates disambiguation of what would otherwise be homographs, such as with the word /vƗn/ (the name “Van” or the type of vehicle commonly called a “van”).

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).

Another assumption of the account presented here is that the syllable structure definitions are embedded within a lexicon structured as a default inheritance hierarchy. For this we use the lexical knowledge representation language DATR (Evans and Gazdar, 1996). This enables the definition of default inheritance networks A Syllable-based Account of Arabic Morphology 47 in a relatively simple and elegant way. In this chapter, we focus on those parts of DATR which are necessary for the exposition of the account of Arabic morphology.

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