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Generate Id Key In Xslt Average ratng: 3,9/5 4173 reviews
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-->This is a thorny one. Functions in XSLT and XQuery can create new nodes, and this is a limited kind of side-effect. If f creates a new node, then f is f is defined to be false; similarly generate-id(f) = generate-id(f) will also be false. This means the optimizer has some work to do to decide whether functions have this effect or not. Apr 28, 2011 Mozilla Foundation Security Advisory 2011-18 XSLT generate-id function heap address leak Announced April 28, 2011 Reporter Chris Evans Impact Low Products. XSLT 2.0 Specification Implemented. There is a restriction, namely that if the argument value is not a compile-time constant, then the function has no information about the names of user-defined extension elements, so it will return false if the name of such an element is supplied.
The <xsl:key> element declares a named key — that is, a name-value pair assigned to a specified element in an XML document. The key is used with the key() function in XPath expressions to help you access the assigned elements in a complex XML document efficiently.
Attributes
- name
Specifies the Qualified Names of the key.
- match
Specifies the Patterns that identifies a node that holds this key.
- use
Specifies an Expressions to be used as the value of the key. The key value can be one of the following: an attribute, a child element, or the content of the matched element.
Element Information
Number of occurrences | Unlimited |
Parent elements | |
Child elements | (No child elements) |
Remarks
You can use keys as generalized IDs for referencing elements in an XML document. To do this, first use <xsl:key> to declare a key for a node. Then call the key() function to retrieve the node, supplying the name and value of the key as the function arguments,. For more information, see the example below.
Multiple keys can be declared on a node. This provides multiple ways to query a node.
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When you work with relatively large XML documents, a key is often a fast wayto query elements. This is because it essentially indexes the locations of the desired nodes ahead of time. However, when <xsl:key> elements are compiled, the XSLT processor will not create such indexes unless a key() function is called against the keys. This ensures that the time-intensive indexing operation is performed only when it is necessary.
In a stylesheet, <xsl:key> elements are top-level elements, and cannot appear within a template. To avoid circular references, you cannot use parameter or variable references as part of an <xsl:key> match.
Example
The following topic provides an example of the <xsl:key> element.
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Generate-id() In Xslt
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