2=...</code>. Special characters may be escaped by <code>\</code> (backslash), whitespace is retained. Empty values are permitted but are ignored for the search. That is, a search with an empty value will have the same effect as not specifying the type at all. Giving a single <code>/</code> will lead to an empty sequence of RDNs (a NULL-DN). Multi-valued RDNs can be formed by placing a <code>+</code> character instead of a <code>/</code> between the AttributeValueAssertions (AVAs) that specify the members o