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The lexeme's type combined with its value is what properly constitutes a token, which can be given to a parser. Some tokens such as parentheses do not really have values, and so the evaluator function for these can return nothing: Only the type is needed.
A lexeme (/ ˈ l ɛ k s iː m / ⓘ) is a unit of lexical meaning that underlies a set of words that are related through inflection. It is a basic abstract unit of meaning, [ 1 ] a unit of morphological analysis in linguistics that roughly corresponds to a set of forms taken by a single root word .
In contrast, the paradigm of a lexeme is the explicit list of the inflected forms of the given lexeme (e.g. to ring, rang, rung). Said in other terms, this is the difference between a description in intension (a morphological pattern) and a description in extension (a paradigm).
Generally, a lexeme is a set of inflected word-forms that is often represented with the citation form in small capitals. [7] For instance, the lexeme eat contains the word-forms eat, eats, eaten, and ate. Eat and eats are thus considered different word-forms belonging to the same lexeme eat.
Construction grammar (often abbreviated CxG) is a family of theories within the field of cognitive linguistics which posit that constructions, or learned pairings of linguistic patterns with meanings, are the fundamental building blocks of human language.
RightArc (current token is the parent of the top of the stack, replaces top) Shift (add current token to the stack) The algorithm can be formulated as comparing the top two tokens of the stack (after adding the next token to the stack) or the top token on the stack and the next token in the sentence.
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In morphology and lexicography, a lemma (pl.: lemmas or lemmata) is the canonical form, [1] dictionary form, or citation form of a set of word forms. [2] In English, for example, break, breaks, broke, broken and breaking are forms of the same lexeme, with break as the lemma by which they are indexed.