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Character entity references can also have the format &name; where name is a case-sensitive alphanumeric string. For example, "λ" can also be encoded as λ in an HTML document. The character entity references <, >, " and & are predefined in HTML and SGML, because <, >, " and & are already used to
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.
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.
HTML standards prior to HTML 4 supported only Western Latin script documents: the treatment of character references above #7F may vary between applications and national conventions. For example, as mentioned above, the correct numeric character reference for the Euro sign "€" U+20AC when using Unicode is decimal € and hexadecimal €.
Simply printing (echoing) user input to the browser without checking it first is something that should be avoided in secure forms processors: if a user entered the JavaScript code < script > alert (1)</ script > into the firstname field, the browser would execute the script on the form_handler.php page, just as if it had been coded by the ...
PHP, JavaScript Active Tier Complete application (Web/Mobile) and build or use the database schema PHP, HTML, JavaScript, Ajax, Full Web application ready to use (PHP and Javascript) with Interface layer, service layer, PHP, CSS. etc. and Database scripts to apply. Spring Roo: Java Active Tier Java and automatically introspected project metadata
Some naming conventions limit whether letters may appear in uppercase or lowercase. Other conventions do not restrict letter case, but attach a well-defined interpretation based on letter case. Some naming conventions specify whether alphabetic, numeric, or alphanumeric characters may be used, and if so, in what sequence.
Enclosed Alphanumeric Supplement is a Unicode block consisting of Latin alphabet characters and Arabic numerals enclosed in circles, ovals or boxes, used for a variety of purposes. It is encoded in the range U+1F100–U+1F1FF in the Supplementary Multilingual Plane .