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List:       xmlbeans-dev
Subject:    [jira] Assigned: (XMLBEANS-313) Whitespace in document causes
From:       "Wing Yew Poon (JIRA)" <xmlbeans-dev () xml ! apache ! org>
Date:       2009-10-25 1:14:59
Message-ID: 2040922820.1256433299507.JavaMail.jira () brutus
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     [ https://issues.apache.org/jira/browse/XMLBEANS-313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel \
]

Wing Yew Poon reassigned XMLBEANS-313:
--------------------------------------

    Assignee: Wing Yew Poon

> Whitespace in document causes unexpected XPath behavior
> -------------------------------------------------------
> 
> Key: XMLBEANS-313
> URL: https://issues.apache.org/jira/browse/XMLBEANS-313
> Project: XMLBeans
> Issue Type: Bug
> Components: XPath
> Environment: Microsoft Windows XP Professional Version 2002 (Service Pack 2)
> Pentium 4 CPU 3.00GHz, 2.00 GB of RAM
> Reporter: Coram Bryant
> Assignee: Wing Yew Poon
> 
> There is a bug in XmlBeans whereby the existence of whitespace in a document, \
> wherein the elements are in a default namespace, causes unexpected XPath results.  \
> There are various ways in which this can be manifested (some more difficult to \
> reproduce than others).  The following code demonstrates a simple condition in \
> which this can be seen, as well as similar conditions in which the bug is not \
> manifested. In short, the following condition causes an invalid XPath:
> 1) The document has a default namespace
> 2) There are pair of siblings, the first of which is preceded by whitespace
> 3) In the context of the first sibling (in document order), the XPath expression \
> "following-sibling::*[1]" yields the first sibling (rather than the second sibling, \
> as would be expected). try 
> {
> 			String xml;
> 			XmlObject xmlObject;
> 			XmlObject[] results;
> 			
> 			// This XML snippet contains a whitespace character before the child1 element.
> // There is a default namespace.
> // These conditions will yield the bug
> 			xml = "<root xmlns='http://some_ns'> <child1/><child2/></root>";
> 			xmlObject = XmlObject.Factory.parse(xml);
> 			results = xmlObject.selectPath("declare namespace sn='http://some_ns'; \
> /sn:root/sn:child1/following-sibling::*[1]/name()");  \
> System.out.println(results[0].xmlText()); // Prints \
> <xml-fragment>child2</xml-fragment>  
> 			// This is the case that yields incorrect results
> // Note that the context element must be the first sibling in order to yield the \
> bug. // The bug does not manifest itself if the XPath expression is evaluated from \
> an ancestor, as shown above.  results = xmlObject.selectPath("declare namespace \
> sn='http://some_ns'; /sn:root/sn:child1");  results = \
> results[0].selectPath("declare namespace sn='http://some_ns'; \
> following-sibling::*[1]/name()");  System.out.println(results[0].xmlText()); // \
> Prints <xml-fragment>child1</xml-fragment>  
> 			
> 			// This XML snippet contains no whitespace characters.
> 			// There is a default namespace.
> // This condition does not cause the bug
> 		        xml = "<root xmlns='http://some_ns'><child1/><child2/></root>";
> 			xmlObject = XmlObject.Factory.parse(xml);
> 			results = xmlObject.selectPath("declare namespace sn='http://some_ns'; \
> /sn:root/sn:child1/following-sibling::*[1]/name()");  \
> System.out.println(results[0].xmlText()); // Prints \
> <xml-fragment>child2</xml-fragment>  
> 			results = xmlObject.selectPath("declare namespace sn='http://some_ns'; \
> /sn:root/sn:child1");  results = results[0].selectPath("declare namespace \
> sn='http://some_ns'; following-sibling::*[1]/name()");  \
> System.out.println(results[0].xmlText()); // Prints \
> <xml-fragment>child2</xml-fragment>  
> 			// This XML Snippet contains a whitespace character before the child1 element.
> 			// There is no namespace.
> // This condition does not cause the bug
> 			xml = "<root> <child1/><child2/></root>";
> 			xmlObject = XmlObject.Factory.parse(xml);
> 			results = xmlObject.selectPath("/root/child1/following-sibling::*[1]/name()");
> 			System.out.println(results[0].xmlText()); // Prints \
> <xml-fragment>child2</xml-fragment>  
> 			results = xmlObject.selectPath("/root/child1");
> 			results = results[0].selectPath("following-sibling::*[1]/name()");
> 			System.out.println(results[0].xmlText());  // Prints \
> <xml-fragment>child2</xml-fragment>  } 
> catch (XmlException e) 
> 	        {
> 			e.printStackTrace();
> 		}

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