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empty() Function (SLAX and XSLT)



SLAX Syntax

XSLT Syntax

Release Information

Function introduced in Junos OS Release 7.6

Support for the slax namespace added in Junos OS Release 12.2.


Test for the presence of a value and return true if the node set or string argument evaluates to an empty value.

The prefix associated with the namespace URI should be defined in the prefix-to-namespace mapping in the style sheet.


(node-set | string)Argument to test for the presence of a value.

Return Value

resultBoolean value, which is true if the argument is empty.

Usage Examples

In the following example, if $set is empty, the script executes the enclosed code block:

The following example tests whether the description node for interface fe-/0/0/0 is empty. If the description is missing, a <message> tag is output.