NW Viewport 005

Test that matched text nodes, comments, and processing instructions are wrapped in document nodes. H/t @galtm for the test case.

Test is expected to pass.

The pipeline

<p:declare-step xmlns:ex="http://example.com/sample"
                xmlns:p="http://www.w3.org/ns/xproc"
                xmlns:t="http://xproc.org/ns/testsuite/3.0" version="3.0">
   <p:output port="result"/>
   <p:identity name="input">
      <p:with-input>
         <doc>ABC</doc>
      </p:with-input>
   </p:identity>
   <p:viewport name="comment" match="/doc/comment()">
      <p:identity>
         <p:with-input>
            <ex:comment unwrapped="{. instance of text()}"
                        wrapped="{. instance of document-node()}"/>
         </p:with-input>
      </p:identity>
   </p:viewport>
   <p:viewport name="pi"
               match="/doc/processing-instruction()">
      <p:with-input pipe="result@input"/>
      <p:identity>
         <p:with-input>
            <ex:processing-instruction unwrapped="{. instance of processing-instruction()}"
                                       wrapped="{. instance of document-node()}"/>
         </p:with-input>
      </p:identity>
   </p:viewport>
   <p:viewport name="text" match="/doc/text()">
      <p:with-input pipe="result@input"/>
      <p:identity>
         <p:with-input>
            <ex:text unwrapped="{. instance of text()}"
                     wrapped="{. instance of document-node()}"/>
         </p:with-input>
      </p:identity>
   </p:viewport>
   <p:viewport name="element" match="/doc">
      <p:with-input pipe="result@input"/>
      <p:identity>
         <p:with-input>
            <ex:element unwrapped="{. instance of element()}"
                        wrapped="{. instance of document-node()}"/>
         </p:with-input>
      </p:identity>
   </p:viewport>
   <p:wrap-sequence wrapper="ex:results">
      <p:with-input pipe="result@comment result@pi result@text result@element"
                    select="//ex:*"/>
   </p:wrap-sequence>
</p:declare-step>

Result

<ex:results xmlns:ex="http://example.com/sample"
            xmlns:t="http://xproc.org/ns/testsuite/3.0">
   <ex:comment unwrapped="false" wrapped="true"/>
   <ex:processing-instruction unwrapped="false"
                              wrapped="true"/>
   <ex:text unwrapped="false" wrapped="true"/>
   <ex:element unwrapped="false" wrapped="true"/>
</ex:results>

Schematron checks

<s:schema xmlns="http://www.w3.org/1999/xhtml"
          xmlns:s="http://purl.oclc.org/dsdl/schematron" xmlns:t="http://xproc.org/ns/testsuite/3.0"
          queryBinding="xslt2">
   <s:ns prefix="ex" uri="http://example.com/sample"/>
   <s:pattern>
      <s:rule context="/">
         <s:assert test="ex:results">The pipeline root is not “results”.</s:assert>
      </s:rule>
   </s:pattern>
   <s:pattern>
      <s:rule context="/ex:results">
         <s:assert test="exists(ex:comment)">No ex:comment element.</s:assert>
         <s:assert test="count(ex:comment) eq 1">Too many ex:comment elements.</s:assert>
         <s:assert test="ex:comment/@unwrapped = 'false' and ex:comment/@wrapped = 'true'">The ex:comment results are incorrect</s:assert>
         <s:assert test="exists(ex:processing-instruction)">No ex:processing-instruction element.</s:assert>
         <s:assert test="count(ex:processing-instruction) eq 1">Too many ex:processing-instruction elements.</s:assert>
         <s:assert test="ex:processing-instruction/@unwrapped = 'false' and ex:processing-instruction/@wrapped = 'true'">The ex:processing-instruction results are incorrect</s:assert>
         <s:assert test="exists(ex:text)">No ex:text element.</s:assert>
         <s:assert test="count(ex:text) eq 1">Too many ex:text elements.</s:assert>
         <s:assert test="ex:text/@unwrapped = 'false' and ex:text/@wrapped = 'true'">The ex:text results are incorrect</s:assert>
         <s:assert test="exists(ex:element)">No ex:element element.</s:assert>
         <s:assert test="count(ex:element) eq 1">Too many ex:element elements.</s:assert>
         <s:assert test="ex:element/@unwrapped = 'false' and ex:element/@wrapped = 'true'">The ex:element results are incorrect</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>

Revision history

01 May 2026, Norm Tovey-Walsh: Initial publication