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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.
Unnecessary use of HTML character references may significantly reduce HTML readability. If the character encoding for a web page is chosen appropriately, then HTML character references are usually only required for markup delimiting characters as mentioned above, and for a few special characters (or none at all if a native Unicode encoding like ...
low double prime quotation mark u+301f: pe, close common ﴿ ornate right parenthesis u+fd3f: ps, open common ︗ ︘ presentation form for vertical left white ...
As another example, if some text was created originally using the MacRoman character set, the left double quotation mark “ will be represented with code point xD2. This will not display properly in a system expecting a document encoded as UTF-8, ISO 8859-1, or CP-1252, where this code point is occupied by the letter Ò.
Web pages authored using HyperText Markup Language may contain multilingual text represented with the Unicode universal character set.Key to the relationship between Unicode and HTML is the relationship between the "document character set", which defines the set of characters that may be present in an HTML document and assigns numbers to them, and the "external character encoding", or "charset ...
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. 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.
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The quoted-printable encoding uses the equals sign as an escape character. URL and URI use % - escapes to quote characters with a special meaning, as for non-ASCII characters. The ampersand ( & ) character may be considered as an escape character in SGML and derived formats such as HTML and XML .