XSLT if Condition | xsl:if syntax

 xsl:if

The xsl:if element is used in XSLT (Extensible Stylesheet Language Transformations) to conditionally process nodes in an XML document. It evaluates a specified condition, and if the condition is true, it processes the content within the <xsl:if> element. If the condition is false, the content is skipped.

XSLT contains a set of elements to perform conditional and iterative processing. 

The <xsl:if> element performs conditional processing and is similar to the if statement in other programming languages. 

<xsl:choose>, <xsl:when>, and <xsl:otherwise>, for conditional processing. 

XSLT uses the <xsl:for-each> element for iterative processing. This element is similar to the do-while or for statements in other programming languages. 

The <xsl:copy> and <xsl:copy-of> elements enable you to copy nodes in the source document to the resultant document.

<xsl:if> Element

You can compare conditions in an XSLT stylesheet using the <xsl-if> element. 

The <xsl:if> element returns a Boolean value, which you can use in a template.

 this element conditionally selects a particular node from the source document.

The syntax for the <xsl:if> element is:

<xsl:if test ="expression"> template body </xsl:if>
<xsl:if test="condition"> <!-- Content to be processed if the condition is true --> </xsl:if>
 test: the test attribute compares strings, numeric values, node-sets, and child nodes of the document tree.This attribute specifies the condition to be evaluated. If the condition evaluates to true, the content inside the <xsl:if> element is processed. If it evaluates to false, the content is ignored.
The <xsl:if> element enables you to check the source tree for a particular element before transforming a source document to a resultant document.  This element also checks the attributes of an element in a source tree.
Ex:<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">  <xsl:template match="person">    <xsl:if test="age &lt; 18">      <xsl:text>Child: </xsl:text>      <xsl:value-of select="name"/>    </xsl:if>  </xsl:template></xsl:stylesheet>

In this example, the XSLT stylesheet processes XML data containing <person> elements and checks if the <age> element within each <person> is less than 18. If the condition is true (i.e., the person is a child), it outputs "Child: " followed by the person's name.