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:<code>&#</code>''nnnn''<code>;</code>
or
:<code>&#x</code>''hhhh''<code>;</code>
where ''nnnn'' is the code point in [[decimal]] form, and ''hhhh'' is the code point in [[hexadecimal]] form. The ''x'' must be lowercase in XML documents. The ''nnnn'' or ''hhhh'' may be any number of digits and may include leading zeros. The ''hhhh'' may mix uppercase and lowercase, though uppercase is the usual style.
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