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separating service level data from business data in servcie contract

Posted By:      Posted Date: September 02, 2010    Points: 0   Category :WCF
Hi I have read that service level data (like requestId, client name etc. required for tracing/auditing) should be separated from business data(required for actual business operation) ie. differencing "Message Header" from "message payload". When we say 'separation", does that mean service level data should not be defined/declared in my contract class. If so how clients will know what header info they have to pass? I can't enforce header info as part of my contract. i think http://blogs.microsoft.co.il/blogs/bursteg/archive/2006/04/23/141.aspx this is based on assumption that clients are aware what they have to pass in header. Regardssinghhome

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