contextual aliases

Rather than globally mapping a class to an alias, it would be nice to make a mapping contextual; that is, to make a mapping conditional upon parent nodes.

For example, if my class has a list of, say, usernames, the generated (and expected) XML for it might look like:

...
<users>
<string>Tom</string>
<string>Dick</string>
<string>Harry</string>
</users>
...

In this case, it would be nice to alias java.lang.String as "user" when contained by "users", resulting in:

...
<users>
<user>Tom</user>
...

Globally aliasing java.lang.String has some obvious drawbacks.

I looked through the code and it looks like this would be a rather large undertaking, but thought I'd toss the idea out.