XSLT <xsl:key> Element
The XSLT element is used to specify 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.
||It specifies the name of the key to be used.
||It specifies that the pattern must be matched to a node that holds this key.
||It specifies XPath expression to identify the value of the nodes of xml document.
XSLT <xsl:key> Element Example
Let's take an example to create a table of <employee> element with its attribute "id"and its child <firstname>, <lastname>, <nickname>, and <salary> by iterating over each employee. This example checks key as firstname to be one of the employee's name and then prints the employee's details.