how to add a sub-attributes in a dictionary

[Toyoda]

Hello,
 I would like to know how to add a sub-attributes in a dictionary file?
 For example,
there is an attribute DIGEST_ATTRIBUTE = 207 and its sub-attribute SIP_URI = 
4.
 How can I define this sub-attribute to the dictionary file?
 I'd appreciate your help.
 J Toyoda
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