RE: schema-aware XML parser (java heap error)
> My java app. which uses the standard schema-aware XML parse > (packaged with > j2sdk1.5.0-01) was hanging up and sometimes I got a java heap > error msg. I > narrowed it to the maxOccurs attribute of a complexType element in my > schema. It seems if maxOccurs> 2000 for this element, the app fails. > 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. Michael Kay http://www.saxonica.com/
PURCHASE STYLUS STUDIO ONLINE TODAY!
Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!
Download The World's Best XML IDE!
Accelerate XML development with our award-winning XML IDE - Download a free trial today!
Subscribe in XML format