follows from the proposition that individual sentences can be transfinitely long, and may preclude the possibility of constructive grammars for natural languages. Langendoen and Postal (1984).
// See Non-tangling Condition.
// n. A labelled point in a tree which represents a constituent of the sentence represented by the tree. The label on the node identifies the syntactic category to which the constituent belongs, and the internal structure of that constituent is shown by the subtree dominated by that node. Nodes may be classified into non-terminal nodes, preterminal nodes and terminal nodes. In the tree below, the lexical items are terminal nodes; the lexical categories Det, N and V are preterminal nodes; all the other nodes are non-terminals:
// n. A way of interpreting a phrase structure rule or immediate dominance rule. A rule interpreted as a node admissibility condition is considered to be, not an instruction for expanding (rewriting) a category, but rather a statement which licenses a local subtree. Such a view dispenses with derivations and permits trees to be regarded as primitive objects: a valid tree is merely one all of whose local subtrees are licensed by rules. The generative capacity of a context-free grammar is unaffected by such a reinterpretation of its rules, but the same is not true of
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Publication information: Book title: A Dictionary of Grammatical Terms in Linguistics. Contributors: R. L. Trask - Author. Publisher: Routledge. Place of publication: London. Publication year: 1993. Page number: 182.
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