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XPointer Basics
Uncover the third and final piece of the XML linking jigsaw with XPointer

| The Need For XPointer |

XPointer evolved as part of the work of the W3C's XML Linking Working Group, which is also responsible for XLink. While developing XLink, the Working Group realized the necessity of a language to address specific nodes - elements or character data - or sets of nodes within an XML document.

This wasn't the only requirement, however - the XML Linking Working Group also identified the following requirements of such a language:

1. XPointers should be based on "descriptive links" - links which identify locations by their context.

2. XPointers should be easy to read and understand; they should also be simple to interpret for browsers and Web servers.

3. It should be possible to create an XPointer for any specific point in a document. Similarly, it should also be possible to create an XPointer that identifies a specific range of data within an XML document.

4. XPointers should include the capability to restrict node selections on the basis of user-imposed constraints, in much the same way as XPath uses predicates.

5. Minor changes to an XML document - changes in whitespace, line breaks and formatting - should not "break" an XPointer.

XPath already existed to meet some of these requirements; however, it is primarily intended for use with XSLT rather than XML links, and therefore does not address some of the more specialized items in the list above.


How to do Everything with PHP & MySQL
How to do Everything with PHP & MySQL, the best-selling book by Melonfire, explains how to take full advantage of PHP's built-in support for MySQL and link the results of database queries to Web pages. You'll get full details on PHP programming and MySQL database development, and then you'll learn to use these two cutting-edge technologies together. Easy-to-follow sample applications include a PHP online shopping cart, a MySQL order tracking system, and a PHP/MySQL news publishing system.

Read more, or grab your copy now!


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