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Back and forth converters between two document formats are said to be conservative if the following holds: given a source document , its conversion , a locally modified version of and the back conversion of , the document is a locally modified version of . We will describe mechanisms for the implementation of such converters, with the LaTeX and TeXmacs formats as our guiding example.

**Authors:**

**Keywords: **conservative document conversion, LaTeX
conversion, TeXmacs, mathematical editing

**A.M.S. subject classification: **68U15, 68U35, 68N99