Before the key function can be called, there must have been a prior declaration of an xsl:key element that has a name attribute that matches the name argument of the key function. The xsl:key element alerts the XSLT processor to create an indexed data structure based upon the key expressions ahead of time. Generate-id Function. Returns a string that uniquely identifies the node in the node-set argument that is first in document order.

• Generate Id Key In Xslt Windows 10
• Xslt Generate-id Key

XML technologies / XSLT / XSLT and XPath functions / Alphabetical XSLT and XPath reference / generate-id XSLT and XPath function reference in alphabetical order (Excerpt from “ XSLT 2.0 & XPath 2.0” by Frank Bongers, chapter 5, translated from German). Oct 22, 2008 The reason that the generate-id method has different results in SPD vs. The browser is that SPD uses MSXML to do its XML/XSL stuff, while the browser is being powered from the server side evaluaiton which uses the.Net Xml libraries. The generate-id function returns a string value that uniquely identifies a specified node. If the node-set specified is empty, an empty string is returned. If you omit the node-set parameter, it defaults to the current node. XSLT v1.0 does not include any explicit support for grouping, however it is possible to achieve the same effect through creative use of the key and generate-id functions. This is called the Muenchian Method after its inventor Steve Muench: Create an index such that all elements with a given key can be retrieved quickly and efficiently.

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

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.

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.

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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.

Generate Id Key In Xslt Windows 10

Example

The following topic provides an example of the <xsl:key> element.

The generate-id function generates a unique id for the first node in a given node-set and returns a string containing that id.

Syntax

Arguments

node-set (optional)

An id will be generated for the first node in this node-set. If omitted, the current context node will be used.

Returns

A string containing the generated id.

Notes

• The same id must be generated every time for the same node in the current document in the current transformation.

• The generated id may not be the same in subsequent transformations.

This function is an XSLT-specific addition to XPath. It is not a part of the core XPath function library.

Defined

Gecko support

Xslt Generate-id Key

Supported.