The class attribute describes the type of trademark used.
Anonymous
| Element | Description | 
|---|---|
| copyright | 
      <copyright
	class="token"
/>
    
      <attribute name="class" >
  <simpleType>
    <restriction base="token">
      <enumeration value="copyright" />
      <enumeration value="trade" />
      <enumeration value="registered" />
      <enumeration value="service" />
    </restriction>
  </simpleType>
</attribute>