found the answer in RFC2253
dc = domain component
>> from url: http://www.openldap.org/doc/admin21/guide.html
>> in the Figure 1.2 the mnemonic dc= is used on a couple of layers at the
>> root of the tree. What does the dc stand for? I checked RFC2251 for the
>> string dc, there were no hits that explained the mnemonic.
>> Alan
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