| X-Radiation: Electromagnetic radiation of the same nature as visible light, but having a wavelength approximately one thousandth that of visible light.
| | XML -- (eXtensible Markup Language) A widely used system for defining data formats. XML provides a very rich system to define complex documents and data structures such as invoices, molecular data, news feeds, glossaries, inventory descriptions, real estate properties, etc.
As long as a programmer has the XML definition for a collection of data (often called a "schema") then they can create a program to reliably process any data formatted according to those rules.
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