<attr> format types

For some reason, Android's documentation about <attr> values is so poor.
I had to look into aapt.exe to find that you can specify these strings as format attribute value:

• reference
• string
• integer
• boolean
• color
• float
• dimension
• fraction

Also, did you know you can specify <enum> inside <attr> to specify set of values?
I will continue investigating this...

UPD: You can specify multiple format values!
Behold: <attr name="test" format="reference|color|fraction"/>

UPD2:You can specify two more attributes: l10n (localization) and type. Their values are ignored though (for now?).

UPD3: You can exclusively specify:

• min & max attributes
• enum child tags
• flags child tags

Although specifying min:max attributes with enum or flag child tags does not result in error, child tags are simply ignored.

UPD4: Min:max values are not checked when specifying attribute value. Also, min can be larger than max. Not implemented, I guess.