Adds a task definition to the current project, such that this new task can be used in the current project.
This task is a form of Typedef with the attributes adapter
and adaptto set to the values org.apache.tools.ant.TaskAdapter
and org.apache.tools.ant.Task
respectively. Anything said in
the manual page of typedef applies to taskdef as well.
Make a task called myjavadoc available to Apache Ant. The
class com.mydomain.JavadocTask implements the task.
<taskdef name="myjavadoc" classname="com.mydomain.JavadocTask"/>