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Web & Internet Definitions

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Definition of CDATA

Abbreviation for Character Data. CDATA is a data type model used in SGML and XML with DTDs. According to HTML 4.0,
"CDATA is a sequence of characters from the document character set and may include character entities. User agents should interpret attribute values as follows:
  • Replace character entities with characters
  • Ignore line feeds
  • Replace each carriage return or tab with a single space.
  • User agents may ignore leading and trailing white space in CDATA attribute values"
The documentation for HTML 4 also places many additional constraints on various attribute's values which are often not expressable using DTD syntax or data types. On this site, the constrained set of values are described.