<grammar xmlns=“relaxng.org/ns/structure/1.0” xmlns:t=“www.thaiopensource.com/ns/annotations” xmlns:a=“relaxng.org/ns/compatibility/annotations/1.0” datatypeLibrary=“www.w3.org/2001/XMLSchema-datatypes”>

 <start>
       <ref name="TEI.2"/>
 </start>
 <define name="IGNORE">
    <notAllowed/>
 </define>
 <define name="INCLUDE">
    <empty/>
 </define>

<include href="demo3.rng"/>

 <define name="TEI.2">
    <element name="TEI.2">
       <text/>
    </element>
 </define>

</grammar>