Is it possible to have characters from multiple encodings into a single XML document? If yes, how?
XML declaration line (and hence the encoding attribute) is optional in the XML document. The parser uses the first bytes (Unicode byte-order-mark) in the document to detect if the document is UTF-8 or UTF-16. If document contains characters from encoding other than UTF-8 and UTF-16, it is required to define the encoding attribute with the correct value. Once the encoding is defined for one character set, it is not possible to redefine the encoding or include data from other encoding. However, if it required to represent data from two different encodings, external entities can be used for this purpose.