Any suggestions, anyone?
Let me rephrase the questions (hoping to help in replying):
1. In (very) short: Is there any way we can search substrings of
values in attributes not having a SUBSTR matching rule defined,
without modifying the schema(s)?
No.
2. If I expand the definition of an attribute - by adding a SUBSTR
matching rule - in a widely distributed schema in cosine.schema,
is there any serious risk which I should consider?
Yes. The proper thing to do would be to start an updated RFC to get the old definitions updated, or to create your own attribute that has improved matching rules. A lot of the old RFCs were created at a time when their current uses weren't imagined, or a need for doing things differently than what they were designed to do wasn't thought of.
--Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration