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Entities are used to define shortcuts to special characters.Entities can be declared internal or external
Syntax
<!ENTITY entity-name "entity-value">
Example
DTD Example:
<!ENTITY writer "Donald Duck.">
<!ENTITY copyright "Copyright w3resource.">
XML example:
<author>&writer;©right;</author>
Syntax
<!ENTITY entity-name SYSTEM "URI/URL">
Example
DTD Example:
<!ENTITY writer SYSTEM "/entities.dtd">
<!ENTITY copyright SYSTEM "/entities.dtd">
XML example:
<author>&writer;©right;</author>