Tests that err:XS0001 is raised if a pipeline contains
  a loop.
Test nw-err-xs0001-004.xml is expected to fail with error code err:XS0001.
<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:identity name="step">
      <p:with-input>
         <p:pipe step="step">
      </p:with-input>
   </p:identity>
</p:declare-step>
Reconstructed test without obsolete step p:parameters.
Initial commit