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Some theories of scope posit a level of syntactic structure called logical form, in which an item's syntactic position corresponds to its semantic scope. Others theories compute scope relations in the semantics itself, using formal tools such as type shifters, monads , and continuations .
In lexical scope (or lexical scoping; also called static scope or static scoping), if a variable name's scope is a certain function, then its scope is the program text of the function definition: within that text, the variable name exists, and is bound to the variable's value, but outside that text, the variable name does not exist.
It is distinguished from phonetic form, the structure which corresponds to a sentence's pronunciation. These separate representations are postulated in order to explain the ways in which an expression's meaning can be partially independent of its pronunciation, e.g. scope ambiguities.
One important discovery of meaning–text linguistics was the recognition that LUs in a language can be related to one another in an abstract semantic sense and that this same relation also holds across many lexically-unrelated pairs or sets of LUs. These relations are represented in meaning–text theory as lexical functions (LF). [14]
Other meaning can be ascribed to text which isn't "structural" in quite the same sense as larger objects, but is still considered "document structure" because it expresses claims about the scope and nature or ontology of portions of a document, rather than instructions about
An abstract syntax tree (AST) is a data structure used in computer science to represent the structure of a program or code snippet. It is a tree representation of the abstract syntactic structure of text (often source code) written in a formal language. Each node of the tree denotes a construct occurring in the text.
Rhetorical structure theory (RST) is a theory of text organization that describes relations that hold between parts of text. It was originally developed by William Mann , Sandra Thompson , Christian M. I. M. Matthiessen and others at the University of Southern California 's Information Sciences Institute (ISI) and defined in a 1988 paper.
Coherence in linguistics is what makes a text semantically meaningful. It is especially dealt with in text linguistics.Coherence is achieved through syntactic features such as the use of deictic, anaphoric and cataphoric elements or a logical tense structure, and semantic features such as presuppositions and implications connected to general world knowledge.