![]() The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). 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 hhhh may mix uppercase and lowercase, though uppercase is the usual style. The nnnn or hhhh may be any number of digits and may include leading zeros. The x must be lowercase in XML documents. Where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form. A numeric character reference refers to a character by its Universal Character Set/ Unicode code point, and a character entity reference refers to a character by a predefined name.Ī numeric character reference uses the format ![]() HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used.
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