Significance of case in responses

[Robert Faulds]

What is the significance of the case in the response to a query? I
seen to recall something about cached vs. authoritative, or some
such thing but can not find any reference to it in any documentation.

Just as an example; If I query for a domain and receive:

> dig query.com

;; ANSWER SECTION:
query.com.	2D IN NS	NS.SOME.DOMAIN
query.com.	2D IN NS	DNS.some.domain

;; AUTHORITY SECTION:
query.com.	2D IN NS	NS.SOME.DOMAIN
query.com.	2D IN NS	DNS.some.domain

;; ADDITIONAL SECTION:
NS.SOME.DOMAIN.	2D IN A		1.2.3.4
DNS.some.domain	2D IN A		4.3.2.1

Why is some or all of the record returned in upper case?

Thanks,
Robert

-- 
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