DTD - Entities

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DTD - Entities



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Entities are used to define shortcuts to special characters.


Entities can be declared internal or external.


An Internal Entity Declaration


Syntax





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



Example




DTD Example:


<!ENTITY writer "Donald Duck.">

<!ENTITY copyright "Copyright W3Schools.">


XML example:


<author>&writer;&copyright;</author>



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


An External Entity Declaration


Syntax




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



Example




DTD Example:


<!ENTITY writer SYSTEM "https://www.w3schools.com/entities.dtd">

<!ENTITY copyright SYSTEM "https://www.w3schools.com/entities.dtd">


XML example:


<author>&writer;&copyright;</author>





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