Numeric character reference: Difference between revisions

Revision as of 16:27, 7 December 2023

Latest revision as of 08:59, 5 February 2025

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In SGML, HTML, and XML, the following are all valid numeric character references for the Greek capital letter Sigma

{| class="wikitable"

|+ Numerical character reference of {{unichar|03A3|GREEK CAPITAL LETTER SIGMA}}<br/>(Note that {{hexadecimal|0931}} = 931₁₀)

|-

! [[Unicode#Upluslink|Unicode character]]

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| U+007B || &amp;#123; || &amp;#x7B; || {

|-

| U+007C || &amp;#124; || &amp;#x7C; || &#124;{{pipe}}

|-

| U+007D || &amp;#125; || &amp;#x7D; || }

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For example, as mentioned above, the correct numeric character reference for the [[Euro sign]] "€" <code>U+20AC</code> when using [[Unicode]] is decimal <code>&amp;#8364;</code> and hexadecimal <code>&amp;#x20AC;</code>. However, if using tools supporting obsolete implementations of HTML, the reference <code>&amp;#128;</code> (Euro sign in the [[CP-1252]] code page) or <code>&amp;#164;</code> (Euro sign in [[ISO/IEC 8859-15]]) may work.

As another example, if some text was created originally using the [[MacRoman]] character set, the [[quotation mark|left double quotation mark]] {{char|“"}} 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]]. The correct numeric character reference for {{char|“"}} in HTML 4 and newer is <code>&amp;#x201C;</code>, because [[Unicode#Upluslink|U+]]201C is its UCS code. In some systems, the [[List of XML and HTML character entity references|named character reference]] <code>&amp;ldquo;</code> may also be available.

==See also==