path id, classpath refid

[Phillipe Rodrigues]

What does path id, classpath refid denotes?

<project ... >
<path id="project.class.path"> ...............(1)
<pathelement location="lib/"/>
<pathelement path="${java.class.path}/"/>
<pathelement path="${additional.path}"/>
</path>

<target ... >
<rmic ...>
<classpath refid="project.class.path"/>.....(2)
</rmic>
</target>

<target ... >
<javac ...>
<classpath refid="project.class.path"/>
</javac>
</target>
</project>

[Jeanne Boyarsky]

Phillipe,
The first one is like a variable. It defines a path that can be referred to from multiple places. The second one actually refers to that earlier defined path.