anchor.diff:  
   .example of @key declarations for a type
   ====
  -++++
  -<programlisting><emphasis role="bold">declare</emphasis> Person
  +[source]
  +----
  +declare Person
       firstName : String @key
       lastName : String @key
       age : int
  -<emphasis role="bold">end</emphasis></programlisting>
  -++++
  +end
  +----
   ====
   
   
  
positive.code: 
  .Declaring a type in the org.drools.examples package
  ====
  ++++
  <programlisting><emphasis role="bold">package</emphasis> org.drools.examples
  
  <emphasis role="bold">import</emphasis> java.util.Date
  
  <emphasis role="bold">declare</emphasis> Person
      name : String
      dateOfBirth : Date
      address : Address
  <emphasis role="bold">end</emphasis></programlisting>
  ++++
  ====
  
  
  
negative.code: 
  .declaring the VoiceCall timestamp attribute
  ====
  [source]
  ----
  declare VoiceCall
      @role( event )
      @timestamp( callDateTime )
  end
  ----
  ====
  
  ==== @duration( <attribute name> )
  