Tests XS0096 is raised, if option is declared with an incorrect sequence type in @as
Test ab-option-004.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:option name="option" as="something">
   <p:identity>
      <p:with-input>
         <doc>{$option}</doc>
      </p:with-input>
   </p:identity>
</p:declare-step>
New tests and some previous texts adapted to recent development
Fix namespace declarations
added new tests