| X-ray |
| High frequency electromagnetic ray of short wave-length, capable of penetrating most solidsubstances. |
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| X.25 |
| International standard of the CCITT for packet switching. |
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| X.400 |
| A CCITT recommendation designed to facilitate international message and informationexchange between subscribers of computer based store-and-forward services and officeinformation systems in association with public and private data networks. |
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| X.500 |
| The CCITT now ITU recommendations (ISO9594) for the structure of directories for themaintenance of addresses used in electronic mail. |
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| XML |
| Extensible mark-up language is an official recommendation by the World Wide WebConsortium as a successor of HTML (Hyper Text Mark-up language) it can be used toconvey documents layout and contents from one computer application to another. XML is asubset of SGML. |
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| XML/EDI |
| The exchange of structured information over the Internet using XML as the syntax. |
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