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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Technically speaking, tagged PDF is a stylized use of the format that builds on the logical structure framework introduced in PDF 1.3. Tagged PDF defines a set of standard structure types and attributes that allow page content (text, graphics, and images) to be extracted and reused for other purposes.

  3. English grammar - Wikipedia

    en.wikipedia.org/wiki/English_grammar

    English grammar is the set of structural rules of the English language.This includes the structure of words, phrases, clauses, sentences, and whole texts.. This article describes a generalized, present-day Standard English – a form of speech and writing used in public discourse, including broadcasting, education, entertainment, government, and news, over a range of registers, from formal to ...

  4. Chomsky hierarchy - Wikipedia

    en.wikipedia.org/wiki/Chomsky_hierarchy

    The Chomsky hierarchy in the fields of formal language theory, computer science, and linguistics, is a containment hierarchy of classes of formal grammars. A formal grammar describes how to form strings from a language's vocabulary (or alphabet) that are valid according to the language's syntax. The linguist Noam Chomsky theorized that four ...

  5. Language documentation - Wikipedia

    en.wikipedia.org/wiki/Language_documentation

    Language documentation provides a firmer foundation for linguistic analysis in that it creates a corpus of materials in the language. The materials in question can range from vocabulary lists and grammar rules to children's books and translated works. These materials can then support claims about the structure of the language and its usage. [5]

  6. Grammar - Wikipedia

    en.wikipedia.org/wiki/Grammar

    In linguistics, a grammar is the set of rules for how a natural language is structured, as demonstrated by its speakers or writers. Grammar rules may concern the use of clauses, phrases, and words. The term may also refer to the study of such rules, a subject that includes phonology, morphology, and syntax, together with phonetics, semantics ...

  7. X-bar theory - Wikipedia

    en.wikipedia.org/wiki/X-bar_theory

    In linguistics, X-bar theory is a model of phrase-structure grammar and a theory of syntactic category formation [1] that was first proposed by Noam Chomsky in 1970 [2] reformulating the ideas of Zellig Harris (1951 [3]), and further developed by Ray Jackendoff (1974, [4] 1977a, [5] 1977b [6]), along the lines of the theory of generative grammar put forth in the 1950s by Chomsky.

  8. Syntactic Structures - Wikipedia

    en.wikipedia.org/wiki/Syntactic_Structures

    Syntax was recognized as the focal point of language production, in which a finite set of rules can produce an infinite number of sentences. Subsequently, morphology (i.e. the study of structure and formation of words) and phonology (i.e. the study of organization of sounds in languages) were relegated in importance.

  9. Phrase structure rules - Wikipedia

    en.wikipedia.org/wiki/Phrase_structure_rules

    A grammar that uses phrase structure rules is a type of phrase structure grammar. Phrase structure rules as they are commonly employed operate according to the constituency relation, and a grammar that employs phrase structure rules is therefore a constituency grammar; as such, it stands in contrast to dependency grammars, which are based on ...