Entity Declarations

Before an entity can be used, it must be declared. All entities are declared with the "ENTITY" declaration:
<!ENTITY legal-notice SYSTEM "legal-notice.xml">

Entities can be declared in a DTD file that is external to the edited document (the external DTD subset), or declared in the edited document (the internal DTD subset). The declarations of internal and external entities in the internal DTD subset can be changed and removed.

Related concepts
Internal Entity
External Entity
Symbols