ab-validate-with-relax-ng-001

The pipeline

<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" name="pipeline" version="3.0">
   <p:output port="result"/>
   <p:validate-with-relax-ng>
      <p:with-input port="source">
         <doc>
            <title>Title</title>
            <p>Some paragraph.</p>
         </doc>
      </p:with-input>
      <p:with-input port="schema">
         <grammar xmlns="http://relaxng.org/ns/structure/1.0">
            <start>
               <ref name="doc"/>
            </start>
            <define name="doc">
               <element name="doc">
                  <optional>
                     <ref name="title"/>
                  </optional>
                  <zeroOrMore>
                     <ref name="p"/>
                  </zeroOrMore>
               </element>
            </define>
            <define name="title">
               <element name="title">
                  <text/>
               </element>
            </define>
            <define name="p">
               <element name="p">
                  <text/>
               </element>
            </define>
         </grammar>
      </p:with-input>
   </p:validate-with-relax-ng>
</p:declare-step>