1<grammar xmlns="http://relaxng.org/ns/structure/1.0"> 2 <start> 3 <ref name="inline"/> 4 </start> 5 6 <define name="inline"> 7 <zeroOrMore> 8 <choice> 9 <text/> 10 <element name="code"> 11 <ref name="inline"/> 12 </element> 13 <element name="em"> 14 <ref name="inline"/> 15 </element> 16 <!-- etc --> 17 </choice> 18 </zeroOrMore> 19 </define> 20</grammar> 21