Error when a variable is initialized with a namespace node

[fgeorges]

Calabash throws an error when the select expression of a p:variable results in a namespace node, instead of getting its string value, which is the namespace URI (if I read the spec correctly). This as already be mentioned in #80. A simple repro is:

<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="1.0">
   <p:input port="source">
      <p:inline xmlns:ns="some-uri">
         <ns:doc>Hello world!</ns:doc>
      </p:inline>
   </p:input>
   <p:output port="result"/>
   <p:variable name="ns-uri" select="/*/namespace::ns"/>
   <p:identity/>
</p:declare-step>

The error is then:

$ java -jar /.../calabash.jar ns-bug.xproc
Feb 19, 2013 5:17:02 PM com.xmlcalabash.util.DefaultXProcMessageListener error
SEVERE: net.sf.saxon.s9api.SaxonApiException: Cannot create a namespace node (ns) whose parent is a document node
Feb 19, 2013 5:17:02 PM com.xmlcalabash.drivers.Main error
SEVERE: com.xmlcalabash.core.XProcException: net.sf.saxon.s9api.SaxonApiException: Cannot create a namespace node (ns) whose parent is a document node
Feb 19, 2013 5:17:02 PM com.xmlcalabash.drivers.Main error
SEVERE: Underlying exception: net.sf.saxon.s9api.SaxonApiException: Cannot create a namespace node (ns) whose parent is a document node

[vojtechtoman]

I have created a new test in the XProc test suite for this: http://tests.xproc.org/tests/required/variable-008.xml