1<grammar xmlns="http://relaxng.org/ns/structure/1.0">
2  <start>
3    <element name="data">
4      <interleave>
5        <text/>
6	<ref name="inline.class"/>
7      </interleave>
8    </element>
9  </start>
10
11  <define name="inline.class" combine="choice">
12    <element name="bold">
13      <ref name="inline"/>
14    </element>
15  </define>
16  
17  <define name="inline.class" combine="choice">
18    <element name="italic">
19      <ref name="inline"/>
20    </element>
21  </define>
22
23  <define name="inline">
24    <zeroOrMore>
25      <choice>
26        <text/>
27        <element name="code">
28          <ref name="inline"/>
29        </element>
30        <element name="em">
31          <ref name="inline"/>
32        </element>
33        <!-- etc -->
34      </choice>
35    </zeroOrMore>
36  </define>
37</grammar>
38