DTD - Entity
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Entities are variables used to define shortcuts for referencing common text or special characters.
Entity reference is a reference to an entity.
Entities can be declared internally or externally.
A declaration of an internal entity
Syntax:
<!ENTITY entity-name "The value of the entity">
Example:
DTD example:
<!ENTITY writer "Bill Gates"> <!ENTITY copyright "Copyright codew3c.com">
XML Examples:
<author>&writer;©right;</author>
Comments: An entity consists of three parts: a ampersand (&), an entity name, and a semicolon (;).
A declaration of an external entity
Syntax:
<!ENTITY entity-name SYSTEM "URI/URL">
Example:
DTD example:
<!ENTITY writer SYSTEM "http://www.codew3c.com/dtd/entities.dtd"> <!ENTITY copyright SYSTEM "http://www.codew3c.com/dtd/entities.dtd">
XML Examples:
<author>&writer;©right;</author>
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