[xep-support] text positioning differences between XEP 3.6.3 and 3.7.x

[Nikolai Grigoriev]

Benoit,

> If possible, it would be nice of RenderX to mention when a new version 
> is subject to alter the AT file format.

The format does not change; it's the formatter output that changes. As a rule 
of thumb, you can expect the formatter output to be stable within a sequence
of maintenance releases (3.6 is identical to 3.6.4, and 3.7 to 3.7.5except for
bugfixes). However, feature-adding releases often introduce new 
functionality or refine interpretations of XSL-FO properties; this 
may lead to slight changes in layout. 

I believe that in order to use the AT format for archive purposes, 
the only safe option is to freeze XEP version. 

Best regards,
Nikolai Grigoriev
RenderX

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