AB-namespace-delete-010

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:output port="result"/>
   <p:namespace-delete xmlns:pre="http://something" prefixes="pre notdeclared">
      <p:with-input>
         <document xmlns:att="http://att" xmlns:att1="http://att1">
            <element att:att="3" att1:att="4"/>
         </document>
      </p:with-input>
   </p:namespace-delete>
</p:declare-step>