> <\body> offers high quality converters to and from . For simple documents, it suffices to use . However, in order to take fully advantage out of the converts, it is necessary to understand some particularities of . First of all, it should be emphasized that / is a data format. Indeed, is a programming language for which no real standardization process has taken place: valid programs are defined as those which are recognized by the program. In particular, there exists no formal specification of the language and it is not even clear what should be considered to be a valid document. As a consequence of this, a converter from to can only be designed to be 100% reliable for a (substantial) subset of the / language. A second important point is that publishers usually impose additional constraints on the kind of documents which they accept for submissions. For instance, certain journals provide additional macros for title information, theorems, specific layout features, etc. Other journals forbid for the definition of new macros in the preamble. Since is a / front-end, it is difficult for us to write specific code for each possible journal. Nevertheless, some general principles do hold, and we will describe below how to customize the converter so as to make the conversion process as simple and automatic as possible. Another point which should be stressed is that aims to provide a strict superset of /. This not completely the case yet, but it is already true that many features in admit no direct analogues in / or one of its packages. This is for instance the case for computer algebra sessions, folding, actions, graphics and presentations, but also for certain typesetting constructs, like vertical alignment and background filling in tables. When using such additional features, you should be prepared that they will not be converted correctly to . Finally, when preparing journal papers with , consider submitting them in format. The editors of the journal will probably force you to convert your paper to , but repeated submissions in format will put pressure upon them to accept this new format. >