[ERR XTSE0210] when importing a stylesheet indirectly

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A imports B
B imports A

This does not work. I get an [ERR XTSE0210] (saxonb-9.0.0.2 for java). I
had a look at the specification and found that this is normal behaviour.
This seems to be one of the rare cases where the spec changed after XSLT
2.0 Programmers Reference Third Edition.

How can I avoid to have circular dependencies, when I have something
like this:

Stylesheet 'A' has several xsl:key definitions. One of them uses a
function of 'B'. B uses some of the key definitions of 'A'. This is a
general requirement, I think. The restriction is really constraining me
or is there a workaround despite from splitting 'A' in many pieces, in
order to avoid circularities? Sometimes this will be impossible, if
there are real circular dependencies (an xsl:key depends on the function
and the function calls exact that key). Another possibility would be, to
include (not xsl:include) the key into 'B', but then I cannot modularize
well, if more than one module depends on the keys of 'A'.

wfg,
Jonny.
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