Clarification on question and the answer section uppercase lower case mis match

[rams]

Hi,
When i queried domain with capital letters , In answer section domain name
is displaying small letters. Is it expected? any RFC for this?

dig @localhost *D.ashwintrail.com*


; <<>> DiG 9.2.4 <<>> @localhost D.ashwintrail.com
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23469
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;D.ashwintrail.com. IN A

;; ANSWER SECTION:
*d.ashwintrail.com. 86400 IN A 2.3.4.5*

;; AUTHORITY SECTION:
ashwintrail.com. 86400 IN NS ramesh.com.
ashwintrail.com. 86400 IN NS ramesh1.com.

;; Query time: 0 msec
;; SERVER: #53
;; WHEN: Tue Apr 10 02:19:00 2012
;; MSG SIZE rcvd: 105

Thanks & Regards,
Ramesh
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