Software Engineering Institute Carnegie Mellon

Acronyms, Abbreviations, and Initialisms

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X
X Window System

X.25
Packet Switching Services Protocol

X.400
ITU Message Handling Services protocol

X.500
ITU Directory Services protocol

X.509
ITU standard for certificate that binds an entity's name to its public key using a digital signature

X3
ANSI Computers and Information Processing Committee

X3H2
Ansi Database Committee

XAPIA
X.400 Application Programming Interface Association

XB
X-Band

XBSS
X/Open Baseline Security Services

XDR
eXternal Data Representation

XDS
X/Open Directory Server

XHTML
Extensible HyperText Markup Language

XICS
Xerox Integrated Composition System

XML
Extensible Markup Language

XO
Executive Officer

XOM
X/Open Object Management

XP
extreme programming

XPG
X/Open Portability Guide

XPG
X/Open's X Portability Guide

XSD
XML Schema Definition

XSITE
Combat System Integrated Trainer Equipment

XSL
Extensible Stylesheet Language

XTI
X/Open transport interface

XTIS
Extended Tool Integration Services

XTP
eXpress Transfer Protocol

XWM
X window manager



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