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Child sequence fragment identifiers use numbers to specify a fragment:
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http://www.trigonblue.com/xml/Equipment.xml#/2/1/3
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The preceding example should be interpreted as follows: / start from the top element of the document; 2 then go to the second child element of the top element; 1 then go to the first subelement of that element; 3 then go to the third subelement of that element. Child sequence fragment identifiers do not have to start from the top element:
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In this example, fragment identification starts from the element with its ID set to "Toshiba". The parser then finds its first subelement and points to its third subelement.
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The full XPointer syntax is built on the W3C XPath recommendation. XPath was originally built to be used by XPointer and XSLT (a language for transforming XML documents into other XML documents), but it has found application in other standards and technologies. You will see in the next chapter how it is used by OpenXML() in SQL Server 2000, but first you need to examine its syntax. Location steps are constructs used to select nodes in an XML document. They have the following syntax:
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axis::node_test[predicate]
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The location step points to the location of other nodes from the position of the current node. If a current node is not specified in any way, the location step is based on the root element. Axes break up the XML document in relation to the current node. You can think of them as a first filter that you apply to an XML document to point to target nodes. Possible axes are listed in Table 13-3. Axes
parent ancestor child descendant self descendant-or-self ancestor-or-self attribute namespace following preceding following-sibling preceding-sibling Table 13-3
Description
The parent of the current node. All ancestors (parent, grandparent, and so on) to the root of the current node. All children of the current node (first generation). All descendants (children, grandchildren, and so forth) of the current node. The current node only. All descendant nodes and the current node. All ancestor nodes and the current node. All attributes of the current node. All namespace nodes of the current node. All nodes after the current node in the XML document. The set does not include attribute nodes, namespace nodes, or ancestors of the context node. All nodes before the current node in the XML document. The set does not include attribute nodes, namespace nodes, or ancestors of the current node. All siblings (children of the same parent) after the current node in the XML document. All siblings (children of the same parent) before the current node in the XML document.
Axes in XPath
13: Introduction to XML for Database Developers
The node test is a second filter that you can apply on nodes specified by axes. Table 13-4 lists all node tests that can be applied. A predicate is a filter in the form of a Boolean expression that evaluates each node in the set obtained after applying axes and node test filters. Developers have a rich set of functions (string, node set, Boolean, and number), comparative operators (=, !=, <=, >= <, >), Boolean operators (And, Or), and operators (+, , *, div, mod). The list is very long (especially the list of functions), and I will not go into detail here. I will just mention the most common function, position(). It returns the position of the node. Let s now review how all segments of the location step function together:
child::Equipment[position()<=10]
This location set first points to child nodes of the current node (root if none is selected). Of all child nodes, only elements named Equipment are left in the set. Finally, each of those nodes is evaluated by position and only the first 10 are specified. Very often, you will try to navigate from node to node through the XML document. You can attach location sets using the forward slash (/). The same character is often used at the beginning of the expression to establish the current node. In the following example, the parser is pointed to the Inventory.xml file, then to its root element, and then to the first child called Equipment, and finally to the first Model node among its children:
Inventory.xml#/child::Equipment[position() = 1]/child:: Model[position() = 1]
It all works in a very similar fashion to the notation of files and folders, and naturally you can write them all together:
http://www.trigonblue.com/xml/Inventory.xml#/child:: Equipment[position() = 1]/child::Model[position() = 1]
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