You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@xmlbeans.apache.org by "Wing Yew Poon (JIRA)" <xm...@xml.apache.org> on 2009/10/25 02:14:59 UTC
[jira] Assigned: (XMLBEANS-313) Whitespace in document causes
unexpected XPath behavior
[ 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();
> }
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@xmlbeans.apache.org
For additional commands, e-mail: dev-help@xmlbeans.apache.org