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https://issues.apache.org/jira/browse/NIFI-9737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18063599#comment-18063599
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Daniel Stieglitz edited comment on NIFI-9737 at 3/6/26 5:23 PM:
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The issue described in this ticket is an Xpath issue and not an NIFI issue. The
explanation of this issue and possible solutions can be found on this
Stackoverflow
[thread|https://stackoverflow.com/questions/23492186/why-xpath-does-not-work-with-xmlns-attribute].
Paraphrased for your example
Placing xmlns="http://latest/nmc-omc/cmNrm.doc#measCollec"; on the root element
of your XML puts the root and its descendants in the
[http://latest/nmc-omc/cmNrm.doc#measCollec] namespace. This effectively means
that all of the element names in your XML document are preceded by
[http://latest/nmc-omc/cmNrm.doc#measCollec]. Yet, the elements stated in your
XPath are not in the [http://latest/nmc-omc/cmNrm.doc#measCollec]. Thus, your
XPath matches nothing.
I was able to get the following XPath to work on your XML
{code:java}
(/*[local-name()='bookstore']/*[local-name()='book'])[1]{code}
was (Author: JIRAUSER294662):
The issue described in this ticket is an Xpath issue and not an NIFI issue. The
explanation of this issue and possible solutions can be found on this
Stackoverflow
[thread|https://stackoverflow.com/questions/23492186/why-xpath-does-not-work-with-xmlns-attribute].
Paraphrased for your example
Placing xmlns="http://latest/nmc-omc/cmNrm.doc#measCollec"; on the root element
of your XML puts the root and its descendants in the
http://latest/nmc-omc/cmNrm.doc#measCollec namespace. This effectively means
that all of the element names in your XML document are preceded by
http://latest/nmc-omc/cmNrm.doc#measCollec. Yet, the elements stated in your
XPath are not in the http://latest/nmc-omc/cmNrm.doc#measCollec. Thus, your
XPath matches nothing.
> Unreachable namespaces seem to break EvaluateXPath/Query
> --------------------------------------------------------
>
> Key: NIFI-9737
> URL: https://issues.apache.org/jira/browse/NIFI-9737
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Cemre Mengu
> Priority: Major
>
> I have an XML file that has
> xmlns="http://latest/nmc-omc/cmNrm.doc#measCollec"; attribute in root tag. As
> long this attribute is present, all expressions evaluate to empty strings. If
> I remove this, everything works as expected.
> I am assuming that it tries and fails to resolve this namespace. However, I
> actually don't need this namespace at all. Is there any way to ignore this
> behavior if it is intentional?
> It can be reproduced with the following simple content where any simple xpath
> expression like /bookstore/book[1] will fail
> {code:java}
> <bookstore xmlns="http://latest/nmc-omc/cmNrm.doc#measCollec"; >
> <book category="cooking">
> <title lang="en">Everyday Italian</title>
> <author>Giada De Laurentiis</author>
> <year>2005</year>
> <price>30.00</price>
> </book>
> </bookstore>{code}
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