MappedAttributeInMetadata Filter

[Rod Widdowson]

> >Now I come to document it, this seems to pretty much overlap with the
> >AttributeInMetadata Filter, only without the latter's configurability.
Do
> >we want to document this or deprecate it?
> 
> What configurability are you thinking of?

I suppose it's less of a configurability and more of a "making up for the
shortcomings".  The attributeName and attributeNameFormat thing.
 
> The EntityAttribute-based filtering doesn't really make much sense to use
> attribute mapping, but I would expect over time that this one would be
more
> ueful than the AttributeInMetadata filter, partly because of its
inefficiency, and
> inability to handle anything but simple value comparison.

I'll buy that.  I'll try to put in some coherent documentation.

/R