Why is there anexpression error here? I would expect that the expression 
number(-10000101) evaluates to a negative number taking part in the comparsion. 
It looks as if the minus sign is not seen as an unary minus, while -10000101 
should have be evaluated by Lua's tonumber(-10000101).

relevant code snippet is:
\xmlfilter{#1}{lpath[number(@date) <= number(-10000101)]/command(...)

xml > lpath > error in expression: number(@date) <= number(-10000101) => 
expr.number((ll.at and ll.at['date'])) <= 

Changing number(-10000101) to -10000101 does not make a difference. 
The @date attribute has no problem with a negative value.

Hans van der Meer

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