Whitespace in document causes unexpected XPath behavior
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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
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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