Seth Kingsley commented on NIFI-1023:

I decided to try a quick-and-dirty version of this, using attributes to define 
namespace fixes. For instance, if you set xmlns.ns1 to [http://namespace/1,] 
that makes it available in XPath expressions.

How strong is the requirement to have a controller service keeping track of the 
namespaces instead?

> Need ability to supply namespace mapping for XPath/XQuery processors
> --------------------------------------------------------------------
>                 Key: NIFI-1023
>                 URL: https://issues.apache.org/jira/browse/NIFI-1023
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>            Reporter: Matt Gilman
>            Priority: Minor
> Possibly consider creating a controller service that provides access to a 
> NamespaceContext which can be used with EvaluteXPath and EvaluateXQuery.

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