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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 in XML, SGML and HTML documents (before HTML5) by using the <!ENTITY name "value"> syntax in a document type definition (DTD).
If the XML document type declaration includes any SYSTEM identifier for the external subset, it can not be safely processed as standalone: the URI should be retrieved, otherwise there may be unknown named character entities whose definition may be needed to correctly parse the effective XML syntax in the internal subset or in the document body ...
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 ...
Character An XML document is a string of characters. Every legal Unicode character (except Null) may appear in an (1.1) XML document (while some are discouraged). Processor and application The processor analyzes the markup and passes structured information to an application. The specification places requirements on what an XML processor must do ...
A numeric character reference in HTML refers to a character by its Universal Character Set/Unicode code point, and uses the format &#nnnn; or &#xhhhh; 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.
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This is a modification of the Epopt's letter above. Changes have been made to make it less specific to the particular situation that inspired the original letter, and more applicable to other cases. Name or Title Address. Dear <NAME>: I am an editor of Wikipedia, a multilingual project to create a complete and accurate encyclopedia by open editing.
An SGML or XML DTD may also include entity declarations in which the token CDATA is used to indicate that entity consists of character data. The character data may appear within the declaration itself or may be available externally, referenced by a URI. In either case, character reference and parameter entity reference markup is allowed in the ...