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From xsl-editors@w3.org: It seems that the notion of grid unit is to be understood in terms of area tree instead of fo tree. This is not obvious in the Recommendation and it might help to explicitely write that. For example, when a table-cell is broken over two pages, does it make one broken grid unit or two separate ones? Thinking in term of FO tree, that would be one; in term of area tree, that would be two. This is important for border resolution, as we can see below.
Adding original poster as CC since response will be required when a solution is proposed.