The class attribute is used to select the type of content.
Anonymous
      <contentFlavourGroup
	language="token"
	userLevel="token"
	technology="token"
	textType="token"
/>
    
      <attribute name="textType" default="normal" >
  <simpleType>
    <restriction base="token">
      <enumeration value="normal" />
      <enumeration value="overview" />
      <enumeration value="prescriptive" />
      <enumeration value="abstract" />
      <enumeration value="conclusion" />
      <enumeration value="legal" />
      <enumeration value="prerequisite" />
      <enumeration value="advertisement" />
    </restriction>
  </simpleType>
</attribute>