The translation power of top-down tree-to-graph transducers
نویسندگان
چکیده
منابع مشابه
The Translation Power of Top-Down Tree-to-Graph Transducers
We introduce a new syntax-directed translation device called top-down tree-to-graph transducer. Such transducers are very similar to the usual (total deterministic) top-down tree transducers except that the right-hand sides of their rules are hypergraphs rather than trees. Since we are aiming at a device which also allows us to translate trees into objects different from graphs, we focus our at...
متن کاملTop-Down Tree-To-Graph Transducers
We introduce a new syntax-directed translation device called top-down treeto-graph transducer. Such transducers are very similar to the usual top-down tree trans ducers except that the right-hand sides of their rules are hypergraphs rather than trees. Since we are aiming at a device which also allows to translate trees into objects ditTerent from graphs, we focus our attention on so-called tree...
متن کاملThe Power of Extended Top-Down Tree Transducers
Extended top-down tree transducers (transducteurs g en eralis es descendants [Arnold, Dauchet: Bi-transductions de forêts. ICALP'76. Edinburgh University Press. 1976]) received renewed interest in the eld of Natural Language Processing. Here those transducers are extensively and systematically studied. Their main properties are identi ed and their relation to classical top-down tree transducers...
متن کاملCompositions of Extended Top-down Tree Transducers
Unfortunately, the class of transformations computed by linear extended top-down tree transducers with regular look-ahead is not closed under composition. It is shown that the class of transformations computed by certain linear bimorphisms coincides with the previously mentioned class. Moreover, it is demonstrated that every linear epsilon-free extended top-down tree transducer with regular loo...
متن کاملComposing extended top-down tree transducers
A composition procedure for linear and nondeleting extended top-down tree transducers is presented. It is demonstrated that the new procedure is more widely applicable than the existing methods. In general, the result of the composition is an extended top-down tree transducer that is no longer linear or nondeleting, but in a number of cases these properties can easily be recovered by a post-pro...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Computer and System Sciences
سال: 1994
ISSN: 0022-0000
DOI: 10.1016/s0022-0000(05)80050-9