Other Data Models
As LDAP has gained momentum, vendors have provided it as an access protocol to other services. The implementation then recasts the data to mimic the LDAP/X.500 model, but how closely this model is followed varies. For example, there is software to access SQL databases through LDAP, even though LDAP does not readily lend itself to this. X.500 servers may support LDAP as well.
Similarly, data previously held in other types of data stores are sometimes moved to LDAP directories. For example, Unix user and group information can be stored in LDAP and accessed via PAM and NSS modules. LDAP is often used by other services for authentication.
An example of such data model is the GLUE Schema, which is used in a distributed information system based on LDAP that enable users, applications and services to discover which services exist in a Grid infrastructure and further information about their structure and state.
Read more about this topic: Lightweight Directory Access Protocol
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