http://www.w3.org/1999/xhtml
group fontstyle

Model

>
(tt | i | b | big | small)

Source

<xs:group name="fontstyle">
  <xs:choice>
    <xs:element ref="tt"/>
    <xs:element ref="i"/>
    <xs:element ref="b"/>
    <xs:element ref="big"/>
    <xs:element ref="small"/>
  </xs:choice>
</xs:group>