1<grammar xmlns="http://relaxng.org/ns/structure/1.0">
2
3<define name="cell.content">
4  <notAllowed/>
5</define>
6
7<start>
8  <element name="table">
9    <oneOrMore>
10      <element name="tr">
11        <oneOrMore>
12	  <element name="td">
13	    <ref name="cell.content"/>
14	  </element>
15        </oneOrMore>
16      </element>
17    </oneOrMore>
18  </element>
19</start>
20
21</grammar>
22