Tests XD0006 is raised, when a non-sequence port is not externally bound.
Test ab-input-026.xml is expected to fail with error code err:XD0006.
<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:input port="source">
   <p:output port="result">
   <p:identity/>
</p:declare-step>
Some new and some changed tests
Fix namespace declarations
More tests.