Essential XML quick reference: a programmer's reference to by Aaron Skonnard

By Aaron Skonnard

This publication is for an individual operating with state-of-the-art mainstream XML applied sciences. It was once in particular designed to function a convenient yet thorough fast reference that solutions the most typical XML-related technical questions. It is going past the conventional pocket reference layout via offering whole assurance of every subject in addition to lots of significant examples. every one bankruptcy offers a short advent, that is through the specified reference details. This process assumes the reader has a simple knowing of the given subject. The certain define (at the beginning), index (in the back), bleeding tabs (along the side), and the web page headers/footers have been designed to aid readers quick locate solutions to their questions.

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Example text

It is not possible to “redefine” the encoding part of the way through. If data in different encodings needs to be represented, then external entities should be used. If an XML document can be read with no reference to external sources, it is said to be a stand-alone document. Such documents can be annotated with a standalone attribute with a value of yes in the XML declaration. If an XML document requires external sources to be resolved to parse correctly and/or to construct the entire data tree (for example, a document with references to external general entities), then it is not a stand-alone document.

The order of these attributes within an XML declaration is fixed. >. Note that although this syntax is identical to that for processing instructions, the XML declaration is not considered to be a processing instruction. 0. book Page 12 Monday, October 1, 2001 8:57 AM 12 Essential XML Quick Reference The character encoding used for the document content can be specified through the encoding attribute. XML documents are inherently Unicode, even when stored in a non-Unicode character encoding. The XML recommendation defines several possible values for the encoding attribute.

The encoding of UTF-8- and UTF-16-encoded documents is detected using the Unicode byte-order-mark. The XML declaration is mandatory if the encoding of the document is anything other than UTF-8 or UTF-16. In practice, this means that documents encoded using US-ASCII can also omit the XML declaration because US-ASCII overlaps entirely with UTF-8. Only one encoding can be used for an entire XML document. It is not possible to “redefine” the encoding part of the way through. If data in different encodings needs to be represented, then external entities should be used.

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