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Article ID: 330311 - Last Review: October 26, 2013 - Revision: 3.4

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This article was previously published under Q330311
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You may experience poor performance when you validate an XML document against a schema that checks for referential integrity.


The XmlValidatingReader class is not fully optimized for validating parent table primary keys, or for validating child table foreign key constraints.


A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next .NET Framework service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site: (
NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:
  Date        Time    Version        Size         File name                Platform
17-Oct-2002 0:38:14 5.50.4134.600   1,063,824    NDP10_QFEM_Q330311_En.exe  i386
After the hotfix is installed, the following files will have the listed attributes or later:
  Date         Version      Size (bytes)     File name        Platform
  15-Oct-2002  1.0.3705.369    1,302,528     System.Xml.dll   i386


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.


For additional information about XSD elements that are affected by this hotfix, visit the following Microsoft Developer Network (MSDN) Web site:
Tables, Columns, Keys, and Constraints in XML Schemas (

  • Microsoft .NET Framework 1.0 Service Pack 2
kbnosurvey kbarchive kbhotfixserver kbqfe kbbug kbfix kbqfe KB330311
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