Xslt Generate-id Function And Key
The xsl:key declaration and the matching XSLT key function overcome these limitations, enabling you to locate source-tree nodes by matching either elements or attributes of any type. When there are no obvious identifier values to use in the source data, you can use the XSLT generate-id function to associate nodes with one another. 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. XSLT/XPath Reference: XSLT elements, EXSLT functions, XPath functions, XPath axes The generate-id function generates a unique id for the first node in a given node-set and returns a string containing that id. The xsl:for-each element allows all nodes in a node-set to be processed according to the XSLT instructions nested inside the xsl:for-each element. Nested for-each loop with sorting.
-->Returns a string that uniquely identifies the node in the node-set argument that is first in document order.
Remarks
The unique identifier must consist of ASCII alphanumeric characters and must start with an alphabetic character. Thus, the string is syntactically an XML name. There is no guarantee that a generated unique identifier will be distinct from any unique IDs specified in the source document. If the node-set argument is empty, the empty string is returned. If the argument is omitted, it defaults to the context node.
Example
XML File (data.xml)
XSLT File (sample.xsl)
This is the formatted output:
When you click the left button in Internet Explorer, an alert box displays 'IDAHAGJD'.
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When you click the right button in Internet Explorer, an alert box displays 'IDAPAGJD'.
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Notice that the ID value is generate at run-time. Therefore, the specific values may vary in different invocation of the transformation.
This is the processor output:
<html>
<body><button>Gambardella, Matthew</button>
<button>Ralls, Kim</button></body>
</html>