DTD - Entities

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 Omegas.">

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

XML example:

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

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