1<grammar xmlns="http://relaxng.org/ns/structure/1.0"> 2 3<start> 4 <element name="doc"> 5 <zeroOrMore> 6 <choice> 7 <element name="p"> 8 <ref name="inline"/> 9 </element> 10 <grammar> 11 <include href="table.rng"> 12 <define name="cell.content"> 13 <parentRef name="inline"/> 14 </define> 15 </include> 16 </grammar> 17 </choice> 18 </zeroOrMore> 19 </element> 20</start> 21 22<define name="inline"> 23 <zeroOrMore> 24 <choice> 25 <text/> 26 <element name="em"> 27 <ref name="inline"/> 28 </element> 29 </choice> 30 </zeroOrMore> 31</define> 32 33</grammar> 34