We are getting periodic NullPointerExceptions while parsing documents.  Here is 
the relevant parts of the stack trace.  Has anyone run into a similar problem 
and know how to solve it?

Thanks
Craig

java.lang.NullPointerException
  
org.apache.xerces.impl.dtd.models.DFAContentModel.buildDFA(DFAContentModel.java:538)
  
org.apache.xerces.impl.dtd.models.DFAContentModel.<init>(DFAContentModel.java:253)
  org.apache.xerces.impl.dtd.DTDGrammar.createChildModel(DTDGrammar.java:2271)
  
org.apache.xerces.impl.dtd.DTDGrammar.getElementContentModelValidator(DTDGrammar.java:1727)
  org.apache.xerces.impl.dtd.DTDGrammar.getElementDecl(DTDGrammar.java:1271)
  
org.apache.xerces.impl.dtd.XMLDTDValidator.getContentSpecType(XMLDTDValidator.java:1645)
  
org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1831)
  
org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:724)
  
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:759)
  
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1477)
  
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:329)
  org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:525)
  org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:581)
  org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:152)
  org.apache.xerces.parsers.DOMParser.parse(DOMParser.java:253)
  org.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:201)
  javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:122)

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