[xep-support] Height of Table Rows With Empty Content

[Nikolai Grigoriev]

Eliot,

> I think the no-height-specified behavior of XEP is a bug 
> since there is content in the cells, which should require 
> that the inline areas be rendered at the current line height.

XEP does not treat ZWSP as a content element: we consider 
it an empty inline that does nothing except enabling line break
at the specified point. What you see are actually empty blocks.
I am not sure it is a bug; just because the semantics of the
character is to generate neither visible marks nor caret move,
a line made of only ZWSPs can be considered empty.

> The ZWSP is there to force XSL Formatter to preserve 
> the blocks (with 2.5R5, XSL Formatter started discarding 
> FOs that have empty content). The second and third cells 
> have start borders to create the ruler effect.

I'd suggest using a space-filled leader technique:
<fo:block><fo:leader/></fo:block> is a typical 
idiom for a block containing a single line. Another
interesting option to create a ruler is by using 
instream SVG: this way, you actually draw the ruler,
not emulate it.

Regards,
Nikolai Grigoriev
RenderX
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