memberOf attribute: part of LDAP v3 standard ?

["Yves Robin" <yves@reefedge.com>]

Hi all,

It seems that, depending on the LDAP server (openldap, Active Directory,
Netscape, ...), a ldapsearch query can (or not)return the memberOf
attribute, as part of the list of returned attributes.

Is this attribute part of LDAP v3 standard or not?
Do all the LDAP servers should support such computed-on-the-fly attribute?

Thanks for help.

Yves