Question

What is the meaning of predefined entities?

Answer 1

In contrast, a character entityreference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either bepredefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD).

Answer 2

I In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD).