XSL-FO Property Resolution / Expressions

Hi,

I have some questions concerning the property resolution when using 
epressions:
What is the result of calling the function "max" (of the core function 
library) with percentage arguments ( e.g. max(100%,120%) ) when 
a) calling it while evaluating the font-size property
b) calling it while evaluating the border-top-width property

Thanks in advance,
Stefan

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