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Download e-book for iPad: XSLT for dummies by Wagner R., Wagner R.

By Wagner R., Wagner R.

ISBN-10: 0764536516

ISBN-13: 9780764536519

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In contrast, XPath’s expressions are almost always placed on a single line. Technical Stuff XPath was originally part of the W3C’s XSLT specification. But after the W3C working group discovered that other non-XSLT specifications, such as XPointer, can use XPath, the group pulled XPath out of the XSLT specification and standardized it on its own. The primary use of XPath is to create location paths, which are instructions that specify what nodes to bring back to the template rule. More precisely, a location path is an XPath expression that is made up of a series of steps called location steps.

These characters are considered part of the XML document by default, so they’re not added to the document tree. ) Tip An XML document tree is often called a Document Object Model (or DOM). Although this may sound like technospeak, a DOM is only the exercise of looking at a document in a tree-like manner. Technical Stuff Because the XSLT processor reads the document as a tree, it has the entire tree available throughout the transformation process. This tree-like approach is much different than simpler XML parsers, such as the Simple API for XML (SAX), which reads an XML document sequentially and therefore deals with elements one at a time.

However, certain axes—ancestor, ancestor-or-self, preceding, and preceding-sibling—travel in reverse order. ) 48 Chapter 5: XPath Espresso Chapter 5: XPath Espresso 49 For example, when processing a match pattern with a descendant axis, the XSLT processor starts with the first descendant defined in the source tree encountered and works its way downward until it reaches the last descendant for the current node. Or, when evaluating a preceding axis, the processor starts with the node just before the current node and works its way to the top of the document tree in reverse order.

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XSLT for dummies by Wagner R., Wagner R.

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