Tagged vs Untagged wrt providing message length

"Barry Reinhold" <[email protected]>
Newsgroups gmane.ietf.rddp
Message-ID <000801c3deab$caf67830$467fa8c0@i8600>
Hemal (or whomever wishes to post),
	Clause 7.4 states that:

"At the Data Sink, DDP MUST provide the ULP Message Length to the ULP 
   when an Untagged DDP Message is Delivered."

Is it thus not required that the length be provided for Tagged DDP
messages? 

I guess I am unclear as to why length is needed for the untagged but not
for the tagged.

Barry Reinhold
Lamprey Networks
[email protected]
(603) 868-8411
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