Xsl Key Generate Id Example
Key Basics
XSLT keys provide a simple and efficient way of looking up values based on other values. First, we will take a look at the syntax of keys and then we will look at how they are used in practice.
Determining if Two Nodes Are the Same Problem You need to determine if two separate references to a node are the same node. Solution If the compared nodes are element - Selection from XSLT Cookbook Book. 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. Declaring Keys and Performing Lookups. February 6, 2002. Bob DuCharme. When you need to look up values based on some other value - especially when your stylesheet needs to do it a lot - XSLT's xsl:key instruction and key function work together to make it. Xsl:for-each select='//pathgenerate-id=generate-id(key('paths',text)1)'. What the expression does is to select all path elements in the document, then consider whether each one is a canonical instance or a duplicate: Extract the text from within the current path element.
<xsl:key/>
/movavi-video-suite-12-activation-key-generator.html. Keys are created with the <xsl:key> tag, which must be a child of <xsl:stylesheet/>. It has three required attributes shown in the table below.
| Attribute | Description |
|---|---|
| name | Name of the key. |
| match | Pattern to match. |
| use | The part of the matched node that will serve as the look-up index. |
The key() Function
The key() function is used to look up the node or nodes specified by the key. It takes two arguments: the name of the key and the index.
The example below shows how to create a key and then look up a value in the key.
Code Sample:
Code Sample:
In the example above, the key is created with this line:
Imagine that it creates a lookup table that looks something like this:
Xsl Key Generate Id Example Word
| Index | Node-set |
|---|---|
| Paul | Paul McCartney beatle node |
| John | John Lennon beatle node |
| George | George beatle node |
| Ringo | Ringo beatle node |
The key() function is used to look up the node or nodes specified by the key. It takes two arguments: the name of the key and the index.
Xsl Generate-id Key Example
Xsl Key Generate Id Example Free
As $Firstname is set to 'John' in the xsl:param, this line above returns 'http://www.johnlennon.com'. As you can see, the key() function returns nodes in the XML document. We can use XPath to drill down further into these nodes. In the example above, we drill down to the link attribute of the beatle node returned by key().