Directory Access Protocol
Click on the red underlined text to get to the source
... This document defines the framework for developing schemas for
directories accessible via the Lightweight Directory Access Protocol.
...
... Wahl, M., Howes, T., and S. Kille, "Lightweight Directory Access Protocol (v3)", RFC 2251prop(-> 4513prop | 4512prop | 4511prop | 4510prop), December 1997. ...
... Wahl, M., Kille, S., and T. Howes, "Lightweight Directory Access Protocol (v3): UTF-8 String Representation of Distinguished Names", RFC 2253(-> 4514prop | 4510prop) ...