Documentación
   
   LDAPv3:
   RFC 4510 - LDAP: Technical Specification Road Map
   RFC 4511 - LDAP: The Protocol
   RFC 4512 - LDAP: Directory Information Models
   RFC 4513 - LDAP: Authentication Methods and Security Mechanisms
   RFC 4514 - LDAP: DN
   RFC 4515 - LDAP: Search Filters
   RFC 4516 - LDAP: URL
   RFC 4517 - LDAP: Syntaxes and Matching Rules
   RFC 4518 - LDAP: Internationalized String Preparation
   RFC 4519 - LDAP: Schema for User Applications 
   
   http://www.openldap.org