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X.400
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Definition
International Telegraph and Telephone Consultative Committee (CCITT), now known as the ITU Telecommunication Standardization Sector, completed the first release of the X.400 message handling system standard. The standard provided for the exchange of messages in a store-and-forward manner without regard to the user's location or computer system.
X.500
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Definition
An ISO OSI Directory Service with an information model, a namespace, a functional model, an authentication framework, and a distributed operation model. X.500 directory protocol is used for communication between a Directory User Agent and a Directory System Agent. To allow heterogeneous networks to share directory information, the ITU proposed a common structure called X.500. However, its complexity and lack of seamless Internet support led to the development of Lightweight Directory Access Protocol (LDAP), which has continued to evolve under the aegis of the IETF. Despite its name, LDAP is too closely linked to X.500 to be "lightweight".
X.509
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Definition
Standards for PKI or Public Key Infrastructure (e.g., Digital Signatures)
X/A
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Definition
An application program interface (API) specification between a global Transaction Manager and Database.
XML Schema
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Definition
XML Schemas express shared vocabularies and allow machines to carry out rules made by people. They provide a means for defining the structure, content and semantics of XML documents