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TXL (Tree Transformation Language) is a domain-specific programming language for transforming tree-based notations. The first version of the language came in 1991 as a successor to the ASF+SDF Meta-Environment. TXL's syntax allows you to describe transformations and analysis on tree structures such as abstract syntax trees, XML, or any other structural representation. It uses pattern matching principles similar to those found in functional programming languages but incorporates more facilities for describing complex transformations concisely. This allows for easier manipulation of structured data that represents programs or documents compared with traditional text manipulation techniques used by general-purpose languages like Perl or Python. Because it specializes in this kind of work, TXL has been useful in fields like compiler construction where manipulating program structure is necessary for analysis or optimization phases, refactoring tools which need to update code according to specified criteria without changing its behavior.

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