Tests XS0096 is raised if a variable has an incorrect sequence type, even if it is not used.
Test ab-variable-006a.xml is expected to fail with error code err:XS0096.
<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:variable name="var" select="4" as="dummy">
   <p:identity>
      <p:with-input>
         <doc/>
      </p:with-input>
   </p:identity>
</p:declare-step>
New tests and some previous texts adapted to recent development
New tests. Some tests changed to new order in p:pipe