Questions on XML Encryption Syntax and Processing Revision 1.29

1. In few places of the draft spec, there is mention of a Type attribute in EncryptedKey element. 
    Where is this defined in the schema provided?

2. Where is the definition on OAEPparamsType?

3. How are ds:DigestMethod and ds:DigestValue related to section 5.6? 
    I don't suppose it is the CMS checksum thing, right? 
    So how are they going to be used?

4. Consider <Person Gender="Male"/> and <Person><Gender>Male</Gender></Person>.
    I can encrypt the "Gender" element but not the "Gender" attribute. 
    What is the rationale? 
    If I can encrypt the "Person" element inclusive of the "Gender" attribute", why is it that I cannot encrypt just the "Gender" attribute?
    

(Note that I have _roughly_ gone through all the archived mails so far and these are not random questions...)