Attribute name with "dot"

[Zico]

Hello Shibboleth gurus,

I am little bit curious about one issue regarding attribute naming in
Shibboleth ( IDP, specially ).
Do we have any restriction of creating some attributes which might have
"dot" in the name?

Say, if I want to create a custom attribute named "sp.email" which will
just get the values of "email"; is it possible to create such
"sp(dot)email" attribute? Or, it is not supported / suggested by
Shibboleth?

Thanks in advance!

-- 
Best,
Zico
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