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In SGML, HTML and XML documents, the logical constructs known as ''character data'' and ''attribute values'' consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a ''character reference'', of which there are two types: a ''numeric character reference'' and a ''character entity reference''. This article lists the character entity references that are valid in HTML and XML documents. A character entity reference refers to the content of a named entity. An entity declaration is created by using the == Character reference overview == A ''numeric character reference'' refers to a character by its Universal Character Set/Unicode ''code point'', and uses the format : &#''nnnn'';or : &#x''hhhh'';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. 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). The format is the same as for any entity reference: : &''name'';where ''name'' is the case-sensitive name of the entity. The semicolon is required. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of XML and HTML character entity references」の詳細全文を読む スポンサード リンク
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