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Chapter 15. XML Characters, Notations, a... > Character Data and Character Sets

Character Data and Character Sets

At its most basic level, an XML document consists of a sequence of characters. Internally, computers generally always used 7 bits to store letters and characters in digital form. This representation was standardized (as ISO/IEC 646) as the now familiar ASCII scheme. XML allows you to use more than the standard ASCII set of characters. The range of legal characters, the characters that can appear in an XML document, are those with the following hexadecimal values:

  • 09 (the tab character)

  • 0D (the carriage return charactery)

  • 0A (the line feed character)

  • 20 to D7FF, E000 to FFFD, and 10000 to 10FFFF (the legal text and graphics characters of Unicode and ISO 10646)


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