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Extension regions may be confusing on a single page master. So far everything is computed relative to the beginning of the page. What about using multiple region bodies of XSL-FO 1.1? That solution would give users more freedom but would require them to impose alignment constraint among regions. [taken from "Design Considerations" draft]
The description for this bug is mistaken that 'everything' is computed relative to the page. 'change-bar-offset' (http://www.w3.org/TR/xsl11/#change-bar-offset) is computed relative to "the edge of the column area containing the text that is marked as changed", and the direction of the 'change-bar-offset' is such that "[a] positive distance is directed away from the column region and into the margin". So there is a precedent for defining a distance relative to an area rather than relative to the page.
Closed. A misunderstanding (Fabio)