# saxon:while

The `saxon:while` element is used to iterate while some condition is true.

The condition is given as a boolean expression in the mandatory test attribute. Because this expression must change its value if the loop is to terminate, the condition will generally reference a variable that is updated somewhere in the loop using an `saxon:assign` element. Alternatively, it may test a condition that is changed by means of a call on an extension function that has side-effects.

Example:

    <xsl:variable name="i" expr="0"/>
    <saxon:while test="$i &lt; 10">
        The value of i is <xsl:value-of select="$i"/>
        <saxon:assign name="i" expr="$i+1"/>
    </saxon:while>

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