Checks XS0107 is raised for a static invalid XPath expression, even if it is never used. (See #506)
Test ab-option-026.xml is expected to fail with error code err:XS0107.
<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:option name="option" select="known-xpath-function()">
   <p:identity>
      <p:with-input>
         <doc/>
      </p:with-input>
   </p:identity>
</p:declare-step>
Changed error code from XS0071 to XS0107.
New tests and some previous texts adapted to recent development
New tests. Some tests changed to new order in p:pipe