http://www.rfc-editor.org/rfc/rfc3909.txt
RFC 3909: Lightweight Directory Access Protocol (LDAP) Cancel Operation, K. Zeilenga2004-10-01T23:00:00-00:00This specification describes a Lightweight Directory Access Protocol (LDAP) extended operation to cancel (or abandon) an outstanding operation. Unlike the LDAP Abandon operation, but like the X.511 Directory Access Protocol (DAP) Abandon operation, this operation has a response which provides an indication of its outcome. [STANDARDS-TRACK]