catch/@tryfor with negative duration

[Marius Plavan <marius.edtf@gmail.com>]

Hi all,

I had to do some conversions from an ISO8601 (xsd:dayTimeDuration) to Java String and back. 
During this task I saw that the specified ISO8601 duration value can be also "negative", when prefixed with '-' ( http://www.schemacentral.com/sc/xsd/t-xsd_dayTimeDuration.html ).

Given that @tryfor may be converted using xsd:dayTimeDuration (in the XTemp translator), should a negative duration be allowed?

Thanks,
Marius