[xsl] XSL FO keep-together=int Implementation?

[Alex Milowski <alexml@xxxxxxxxxxxx>]

Does anyone know of a XSL implementation (commercial, free, or 
open-source)
that implements the keep-together property with an integer value?  Many 
of
the implementations implement keep-together="always" but do not process
integer values.

I really want to be able to specify an integer value so that long 
program
listings can get broken across a page but short ones will cause a page
break.

Now, to shorten that list to possibly zero, I'd like that same 
implementation
to support MathML! Never satisfied... :)

-- Alex Milowski  

"The excellence of grammar as a guide is proportional to the paucity of 
the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics