SMALLTALK-80: the interactive programming environment
SMALLTALK-80: the interactive programming environment
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OOPLSA '86 Conference proceedings on Object-oriented programming systems, languages and applications
A programmer's guide to object-oriented programming in Common LISP
A programmer's guide to object-oriented programming in Common LISP
A structure for efficient update, incremental redisplay and undo in graphical editors
Software—Practice & Experience
Common LISP: the language (2nd ed.)
Common LISP: the language (2nd ed.)
OSF/Motif reference guide
XLIB Programming Manual and Reference Manual
XLIB Programming Manual and Reference Manual
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Mathematical and computational aspects of lexicalized grammars
Mathematical and computational aspects of lexicalized grammars
Using lexicalized tags for machine translation
COLING '90 Proceedings of the 13th conference on Computational linguistics - Volume 3
Synchronous tree-adjoining grammars
COLING '90 Proceedings of the 13th conference on Computational linguistics - Volume 3
Parsing strategies with 'lexicalized' grammars: application to tree adjoining grammars
COLING '88 Proceedings of the 12th conference on Computational linguistics - Volume 2
Feature structures based Tree Adjoining Grammars
COLING '88 Proceedings of the 12th conference on Computational linguistics - Volume 2
A freely available wide coverage morphological analyzer for English
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 3
Using descriptions of trees in a tree adjoining grammar
Computational Linguistics
An Animated On-Line Community with Artificial Agents
IEEE MultiMedia
Some novel applications of Explanation-Based Learning to parsing Lexicalized Tree-Adjoining Grammars
ACL '95 Proceedings of the 33rd annual meeting on Association for Computational Linguistics
Generating an LTAG out of a principle-based hierarchical representation
ACL '96 Proceedings of the 34th annual meeting on Association for Computational Linguistics
Synchronous tags and French pronominal clitics
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 1
A freely available wide coverage morphological analyzer for English
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 3
A principle-based hierarchical representation of LTAGs
COLING '96 Proceedings of the 16th conference on Computational linguistics - Volume 1
A freely available wide coverage morphological analyzer for English
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 3
A debug tool for practical grammar development
ACL '03 Proceedings of the 41st Annual Meeting on Association for Computational Linguistics - Volume 2
Toward the formal verification of a unification system
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
Toward the formal verification of a unification system
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics - Special issue on cybernetics and cognitive informatics
INLG '06 Proceedings of the Fourth International Natural Language Generation Conference
Dialog structure automatic modeling
MICAI'10 Proceedings of the 9th Mexican international conference on Advances in artificial intelligence: Part I
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We describe a workbench (XTAG) for the development of tree-adjoining grammars and their parsers, and discuss some issues that arise in the design of the graphical interface.Contrary to string rewriting grammars generating trees, the elementary objects manipulated by a tree-adjoining grammar are extended trees (i.e. trees of depth one or more) which capture syntactic information of lexical items. The unique characteristics of tree-adjoining grammars, its elementary objects found in the lexicon (extended trees) and the derivational history of derived trees (also a tree), require a specially crafted interface in which the perspective has shifted from a string-based to a tree-based system. XTAG provides such a graphical interface in which the elementary objects are trees (or tree sets) and not symbols (or strings).The kernel of XTAG is a predictive left to right parser for unification-based tree-adjoining grammar [Schabes, 1991]. XTAG includes a graphical editor for trees, a graphical tree printer, utilities for manipulating and displaying feature structures for unification-based tree-adjoining grammar, facilities for keeping track of the derivational history of TAG trees combined with adjoining and substitution, a parser for unification based tree-adjoining grammars, utilities for defining grammars and lexicons for tree-adjoining grammars, a morphological recognizer for English (75 000 stems deriving 280 000 inflected forms) and a tree-adjoining grammar for English that covers a large range of linguistic phenomena.Considerations of portability, efficiency, homogeneity and ease of maintenance, lead us to the use of Common Lisp without its object language addition and to the use of the X Window interface to Common Lisp (CLX) for the implementation of XTAG.XTAG without the large morphological and syntactic lexicons is public domain software. The large morphological and syntactic lexicons can be obtained through an agreement with ACL's Data Collection Initiative.XTAG runs under Common Lisp and X Window (CLX).