Tests that err:XS0037 is raised when p:output
      contains non whitespace text nodes.
Test ab-err-s0037-005.xml is expected to fail with error code err:XS0037.
<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:pipe step="identity">This is illegal text
            </p:output>
   <p:identity name="identity">
      <p:with-input>
         <doc/>
      </p:with-input>
   </p:identity>
</p:declare-step>
Corrected the error code.
Fix namespace declarations
More tests.