Tests p:document that a binary document preserves unknown content-type.
Test ab-p-document028.xml is expected to pass.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:output port="result">
   <p:cast-content-type content-type="application/xml">
      <p:with-input select="p:document-properties(.)">
         <p:document href="../documents/ab-doc.zip">
      </p:with-input>
   </p:cast-content-type>
</p:declare-step>
<s:schema xmlns="http://www.w3.org/1999/xhtml" xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
   <s:ns uri="http://www.w3.org/2005/xpath-functions" prefix="j">
   <s:pattern>
      <s:rule context="/">
         <s:assert test="j:map">There is no root element 'map'.</s:assert>
         <s:assert test="j:map/j:string[@key='content-type']/text() = 'application/zip'">Content-type is not 'application/zip'.</s:assert>
         <s:assert test="ends-with(j:map/j:string[@key='base-uri']/text(),'/documents/ab-doc.zip')">Base-uri does not end with '/documents/ab-doc.zip'.</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>
Added attribute 'queryBinding' to schematron's schema.
Change test from p:document-properties-document() to p:document-properties.
Fixed result document
            (
                  c:document-properties, not 
                  p:document-properties)
Fix #46
Now I have all tests where p:document needs a content-type according to the new specs
More tests.