[xep-support] using a function in an expression

[Alexander Peshkov]

Hello Bob,

In general you can use property functions in an expression for
another property, however in this particular case you hit a limitation
of XEP: you cannot safely do arithmetics with indents and margins.
I'll reiterate recent Nikolay's comment on this subject:
(http://xep.xattic.com/lists/xep-support/2063.html)

Technically, it happens because the default 'start-indent' is treated
not as '0pt' but as a special value, to account for start-indent
redefinition due to margins.). To make additive expressions work, you
can add an explicit start-indent="0" specifier somewhere at the top:
it will populate all descendant nodes with the inherited value.

Note that any appearance of margin will reset start-indent value.

Best regards,
Alexander Peshkov                             mailto:peshkov at renderx.com
RenderX

BS> I thought one could use property functions in an expression for another
BS> property. For example, in computing a content-width on a graphic so that it
BS> responds to the current start-indent, I tried:

BS> content-width="4in - inherited-property-value(start-indent)"

BS> But XEP 3.7.8 complains with:

BS> [warning] Bad attribute content-width: Cannot subtract type Word from type
BS> Length

BS> Shouldn't that work?

BS> Bob Stayton
BS> Sagehill Enterprises
BS> DocBook Consulting
BS> bobs at sagehill.net



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