I think its a good idea if you are trying to create more "reuseable"
components, and separate orchestration out of the Java code.
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It's pretty new (since 1.1.5 or 1.1.6) (hence no examples) but I have to say I
find it wonderful (I use a mix of .page.xml and pages.xml - and there should be
/path/to//view/pages.xml soon for a medium-granularity approach).
I find it fits *really* well with putting navigation in pages.xml - its