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Re: schema-aware XML parser (java heap error)


thunderbird xml
Michael Kay wrote:
 > The standard algorithms for generating a finite-state machine from a 
grammar
 > suffer from the problem that the number of possible states becomes very
 > large when you use a large value of minOccurs or maxOccurs, which 
causes an
 > increasing use of memory. Saxon's schema processor deals with this by
 > treating a large maxOccurs as if you had specified "unbounded" (with a
 > warning), which is only marginally better than falling over completely.
 > Henry Thompson was promising to publish an improved algorithm but I 
haven't
 > seen it yet...
 >
 > I would suggest that you treat this constraint as one of those that 
are best
 > checked at application level, or using a tool such as schematron.
 > Grammar-based validators aren't good at this job.

This note may be of interest:

http://jroller.com/comments/bobfoster/FullSpeedAhead/derivatives_of_bounded_repitition

(sic)

Bob Foster


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