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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).
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.
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 ...
When the XML document is converted to a more limited character set, such as ASCII, characters that can no longer be represented are converted to &#nnn; character references for a lossless conversion. But within a CDATA section, these characters can not be represented at all, and have to be removed or converted to some equivalent, altering the ...
The process of checking to see if a XML document conforms to a schema is called validation, which is separate from XML's core concept of syntactic well-formedness.All XML documents must be well-formed, but it is not required that a document be valid unless the XML parser is "validating", in which case the document is also checked for conformance with its associated schema.
Titles cannot contain images (which would require forbidden characters in order to be displayed), only Unicode characters. For example, the recycling symbol ♲ is encoded in Unicode as U+2672, so it can be included, but the non-directional beacon symbol is not a Unicode character and cannot appear in a page title.
XML-enabled databases typically offer one or more of the following approaches to storing XML within the traditional relational structure: XML is stored into a CLOB (Character large object) XML is `shredded` into a series of Tables based on a Schema [5] XML is stored into a native XML Type as defined by ISO Standard 9075-14 [6]
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. You don't need to describe or explain what these tags mean.