CNAME RRs

[Richard Willmann]

hello,

 i would like to ask according to DNS glossary founded on Men&Mice web site
about CNAME RRs. The CNAME RR according to RFC1035 can not share owner name
with any other RR. But, this time I have found following statement:

--- CUT ---
A domain name that has a CNAME record can't have any children. So if
glossary.example.com has a CNAME record, Then jobs.glossary.example.com is
improper.
--- CUT ---

 ??? it is true? If yes, according to what?

 on the other hand, is multiple CNAME RR with same owner (alias) name
"officialy" permited (for may be load balancing issues). I know, that the
newer version of bind name server have a special switch to allow this, but i
can not found any RFC and/or other document on the net, where this is
clarificated.

 thanks a lot

rwi