1  <grammar xmlns="http://relaxng.org/ns/structure/1.0">
 2    <start>
 3      <element name="p">
 4        <ref name="inline"/>
 5      </element>
 6    </start>
 7  
 8    <define name="inline">
 9      <choice>
10        <text/>
11        <element name="bold">
12          <ref name="inline"/>
13        </element>
14        <element name="italic">
15          <ref name="inline"/>
16        </element>
17        <element name="span">
18          <optional>
19    	<attribute name="style"/>
20          </optional>
21          <ref name="inline"/>
22        </element>
23      </choice>
24      <optional>
25        <ref name="inline"/>
26      </optional>
27    </define>
28  </grammar>