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In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
On the opposite, the code point U+0085 is a valid control character in Unicode and ISO/IEC 10646, as well as in XML 1.0 and XML 1.1 documents (in all contexts), and its usage is not discouraged (it is treated as whitespace in many XML contexts, or as a line-break control similar to U+000D and U+000A in preformatted texts in some XML applications).
Single or double quotation marks denote either speech or a quotation. Double quotes are preferred in the United States, and also tend to be preferred in Australia [11] [12] (though the Australian Government prefers single quotes) [13] and Canada. Single quotes are more usual in the United Kingdom, Ireland and South Africa, though double quotes ...
This allows some characters that are needed for the core syntax of HTML or XML themselves to be escaped from their special syntactic role (notably "&" which is reserved for beginning entity references, "<" or ">" which delimit the markup tags, and "double" or 'single' quotation marks, which delimit the values of attributes and entity definitions).
The closing single quotation mark is identical in form to the apostrophe and similar to the prime symbol. The double quotation mark is identical to the ditto mark in English-language usage. It is also similar to—and often used to represent—the double prime symbol. These all serve different purposes.
One of the oldest examples is in shell scripts, where single quotes indicate a raw string or "literal string", while double quotes have escape sequences and variable interpolation. For example, in Python , raw strings are preceded by an r or R – compare 'C:\\Windows' with r'C:\Windows' (though, a Python raw string cannot end in an odd number ...
There is a single "root" element that contains all the other elements. A valid XML document is defined in the XML specification as a well-formed XML document which also conforms to the rules of a Document Type Definition (DTD). According to JavaCommerce.com XML tutorial, "Well formed XML documents simply markup pages with descriptive tags.
A character literal is a type of literal in programming for the representation of a single character's value within the source code of a computer program.. Languages that have a dedicated character data type generally include character literals; these include C, C++, Java, [1] and Visual Basic. [2]