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Substrings any match on an empty string

Title: Substrings any match on an empty string

Hi all,

Does anyone have an answer to this question:

If I specify a filter of type 'substrings' where the substrings contain only an 'any' with a zero-length value, should I return all entries containing the attribute?

It seems to me that the empty string is a substring of all strings.

I've looked in RFC 2251, X.511 and X.520 but have not seen a statement which I could interpret as answering this question.

Thanks for your help,

Ron