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The Heidelberg website glossary explains, in alphabetical order, a multitude of terms relevant to printing, as well as some terms used in Heidelberg's product catalogue.

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Xerography

Xerography, invented in 1937 by the American patent lawyer Chester F. Carlson, is a printing method originally developed for copiers but is now also used with laser printers and digital printing systems. The technology is based on a drum coated with a photo semiconductor which is charged up and then partially discharged by a motif projected onto it. Dark areas retain their charge and toner applied to these areas remains in place. The image created in this way is then transferred to paper and fixed with heat.

XML

XML (Extensible Markup Language) is a symbol language which is used to describe the structure of documents. Externally, XML is similar to HTML (Hypertext Markup Language) used throughout the Internet. The most important difference lies in the fact that the symbols (“tags”) used in XML can be selected with a great degree of freedom, while they are fixed in HTML. This allows special forms of XML to be generated for virtually any type of application. XML is essentially a slimmed-down form of the SGML (Standard Generalized Markup Language) document description language defined in ISO 8879 and was created for transmitting richly structured documents via the World Wide Web. The International World Wide Web Consortium is responsible for standardization of XML.

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