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Many developers use entities in their XHTML for special characters, but in XML you can also define entities to make authoring easier, or to reference the content of external documents. Entities are also useful when you create a Document Type Definition (DTD) and want to reduce its apparent complexity to keep it readable by humans. This article will tell you all about XML entities and show you how to take advantage of them in your documents.

XML is a well-supported Internet standard for encoding structured data in a way that can be easily decoded by practically any programming language and even read or written by humans using standard text editors. Many applications, especially modern standards-compliant Web browsers, can deal directly with XML data.

Entities in XML are used to represent specific characters (that are generally difficult or impossible to produce on a standard keyboard), to re-use snippets of XML, to organize your documents into several files, and to make it easier to write DTDs.



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http://www.ibm.com/developerworks/xml/library/x-entities/?S_TACT=105AG...




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