The LDAP Application Program Interface, described by RFC 1823, is an Informational RFC that specifies an application programming interface in the C programming language for version 2 of the Lightweight Directory Access Protocol.
Version 2 of LDAP is historic.
Commonly available LDAP C APIs do not strictly adhere to this specification.
A draft standard is under development for LDAP version 3.
[1] This programming-language-related article is a stub.