<define> task for NAnt

Essentially, you write a new task like this:

<define name="echo3">
  <echo message="${this.message}"/>
  <echo message="${this.message}"/>
  <echo message="${this.message}"/>
</define>

...and then you call it like this:

<echo3 message="Hello World"/>

Any parameter passed to the defined task is available as this.foo inside the defined task. I've found it useful when you don't want to write a task in C#, perhaps because all you're doing is calling a bunch of other NAnt tasks.