How to use lang operation in Boolean Function Using XPath in Xml

In this article I will explain lang operation of Boolean function.
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Introduction

The  lang operation in  Boolean  function can be used to match the attribute value in the node-sets.If the argument of the lang operation can be match with the attribute of the current node then the boolean value true is return otherwise return false.

Syntax

boolean lang(string)

Example

Suppose the argument that we pass in the lang function is "en" that is
lang("en")

then the following node-sets current nodes attributes will be checked:

<xml lang="en">
<xml lang="en">
<xml lang="eng">

Output

true
true
false

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