1<grammar xmlns="http://relaxng.org/ns/structure/1.0"> 2 3 <define name="inline"> 4 <zeroOrMore> 5 <choice> 6 <text/> 7 <element name="bold"> 8 <ref name="inline"/> 9 </element> 10 <element name="italic"> 11 <ref name="inline"/> 12 </element> 13 <ref name="inline.extra"/> 14 </choice> 15 </zeroOrMore> 16 </define> 17 18 <define name="inline.extra"> 19 <notAllowed/> 20 </define> 21 22</grammar> 23