lift `??` construct and maven example

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Published on 2010-04-18T00:05:37Z Indexed on 2010/04/18 0:13 UTC
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Hi, I have browsed lift's MegaProtoUser and encountered this construction: ??("Last Name"). Can anyone explain, what that means? Also, I didn't find a way how to add a custom field into MegaProtoUser. The maven's lift's basic archetype defines another field, but it never shows anywhere. (Version 1.0)
Thanks for answering

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