Reverse attribute mapping..

[Tom Zeller]

>>Further feedback?

I suggest not mixing <property> and p-namespace to avoid potential confusion.

I think that the bean name (the "id" attribute) and the "id" property
should have the same value, or am I missing something ?
 <bean id="RequestedAttributesMapper" ... p:id="Mappers">

How about an idp-attribute-mapper-api|impl module ? Mapping seems
different from resolution and filtering, is somewhat "new" to v3, and
whether we use native Spring XML or custom I think a separate module
is okay. The "long" class names make me think : new module.