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Posted to j-dev@xerces.apache.org by "Michael Glavassevich (JIRA)" <xe...@xml.apache.org> on 2007/02/23 19:25:06 UTC
[jira] Resolved: (XERCESJ-773) Poor performance when processing
schemas with high values of maxOccurs
[ https://issues.apache.org/jira/browse/XERCESJ-773?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Glavassevich resolved XERCESJ-773.
------------------------------------------
Resolution: Fixed
I've just committed an improvement to code in SVN which covers a number of common cases. We now build a representation of large minOccurs/maxOccurs in constant time and memory (which uses a counter during validation) for element and wildcard particles when each model group particle in the content model:
* has minOccurs/maxOccurs == 1; or
* contains only one element/wildcard particle with minOccurs/maxOccurs == 1
Handling sequences, choices and nested minOccurs/maxOccurs is somewhat tricker. We would need a more general solution than the one implemented for elements and wildcards to process those gracefully. I've opened a new JIRA issue [1] for tracking that.
[1] http://issues.apache.org/jira/browse/XERCESJ-1227
> Poor performance when processing schemas with high values of maxOccurs
> ----------------------------------------------------------------------
>
> Key: XERCESJ-773
> URL: https://issues.apache.org/jira/browse/XERCESJ-773
> Project: Xerces2-J
> Issue Type: Bug
> Components: XML Schema Structures
> Affects Versions: 2.5.0
> Environment: Operating System: Linux
> Platform: PC
> Reporter: Steve Baker
> Assigned To: Michael Glavassevich
>
> When validating an instance of an XML order against its schema, the process took
> 5 minutes 7 seconds and required an increased maximum heap size to run to
> completion.
> The problem was traced to a maxOccurs value of 9999 on an element (the
> OrderLine). Changing this to unbounded reduced the time taked to 1.16 seconds
> and required no increase in the default heap size.
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