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DTD - Entities

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Entities are variables used to define shortcuts to standard text or special characters.

  • Entity references are references to entities

  • Entities can be declared internal or external

An Internal Entity Declaration


<!ENTITY entity-name "entity-value">


DTD Example:
<!ENTITY writer "Donald Duck.">
<!ENTITY copyright "Copyright W3Schools.">
XML example:

Note: An entity has three parts: an ampersand (&), an entity name, and a semicolon (;).

An External Entity Declaration


<!ENTITY entity-name SYSTEM "URI/URL">


DTD Example:
<!ENTITY writer SYSTEM "http://www.w3schools.com/entities.dtd">
<!ENTITY copyright SYSTEM "http://www.w3schools.com/entities.dtd">
XML example:
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