Struts/Tiles question

Factual Questions
1

If you have a tiles definition like this:
<definition name=“foo” path="/foo.jsp">
<put name=“bar” value=“foo.bar” />
</definition>

and foo.bar is defined thusly:
<definition name=“foo.bar” path="/foobar.jsp">
<put name=“bim” value=“aSimpleTextStringForExample” />
</definition>

Where in the TilesRequestProcessor does foo.bar get resolved? I have been stepping through with my debugger in Eclipse and I can’t find it. Does anyone know? I am using Struts 1.2.4.

Thanks for your help,
Rob