ab-validate-with-relax-ng-015

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" name="pipeline" version="3.0">
   <p:output port="result"/>
   <p:validate-with-relax-ng dtd-id-idref-warnings="true">
      <p:with-input port="source">
         <doc>
            <title>Title</title>
            <p>Some paragraph.</p>
            <p idref="foo">Some other paragraph</p>
         </doc>
      </p:with-input>
      <p:with-input port="schema">
         <p:inline content-type="text/plain" expand-text="false">
        namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
        
        element doc {
        element title {
        [ a:defaultValue="en-us" ]
        attribute language { text }?,
        text
        }?,
        element p {
        attribute id { xsd:ID }?,
        attribute idref { xsd:IDREF }?,
        text
        }*
        }
      </p:inline>
      </p:with-input>
   </p:validate-with-relax-ng>
</p:declare-step>