Optional Components

[Berin Loritsch <bl...@apache.org>]

If you want to add functionality to existing core components (such as
JaxpParser and TraxTransformer), please take advantage of the "hasComponent"
method on the ComponentManager before requesting the Component.

I fixed the unnecessary requirement of the Deli jar for runtime systems
by changing part of the compose method like this:

void compose(ComponentManager manager)
{
     // ... skip other stuff

     if (manager.hasComponent(Deli.ROLE))
     {
         this.deli = (Deli) manager.lookup(Deli.ROLE);
     }
}


This also allows the entry to stay in the RoleManager.

-- 

"They that give up essential liberty to obtain a little temporary safety
  deserve neither liberty nor safety."
                 - Benjamin Franklin


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