Xslt Generate-id Function And Key
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.
- Aug 20, 2008 I have a simple stylesheet that attempts to lookup a value using the xsl:key tag and key functions. I can easily get this to work if the lookup table is in a file and read it in using the 'document' function, as follows.
- Jun 22, 2010 how can use generate-id function in xsl to genarate uniq id for selected element You just put the element as an argument of generate-id function - e.g. Xsl:value-of select='generate-id(/.)' /. Note that the genereated id may be different each time you do the transformation. Pawel Well /. selects the root element and that way your code always.
- XSLT Tutorial
- XSLT Useful Resources
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. For a given transformation, every time you invoke generate-id against a given node, the XSLT processor must return the same ID. The ID can’t change while you’re doing a transformation. If you ask the XSLT processor to transform your document with this stylesheet tomorrow, there’s no guarantee that generate-id will generate the same ID the second time around.
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<xsl:key> tag element specifies a named name-value pair assigned to a specific element in an XML document. This key is used with the key() function in XPath expressions to access the assigned elements in an XML document.
Declaration
Following is the syntax declaration of <xsl:key> element.
Attributes
| S.No | Name & Description |
|---|---|
| 1 | Name Name of the key to be used. |
| 2 | Php defuse crypto generate encryption key. Match Patterns used to identify a node that holds this key. |
| 3 | Use XPath expression to identify the value of the nodes of xml document. |
Elements
| Number of Occurrences | Unlimited |
| Parent elements | xsl:stylesheet |
| Child elements | None |
Demo Example
Xsl Document Function
This example creates a table of <student> element with its attribute rollno and its child <firstname>, <lastname>, <nickname>, and <marks> by iterating over each student. It checks key as firstname to be one of the student's name and then prints the student details.
students.xml
students.xsl