XSLT for Dummies

The final major data type XSLT deals with is boolean, which is a simple binary state (true or false). The four built-in functions for boolean values are: not() , true() , false() , and boolean() .

Returning the opposite value

To return a value thats opposite from the one you have, you can use the not() function:

boolean not(boolean)

The following xsl:if instruction evaluates to true if the myvar variable is not true:

<xsl:if test="not($myvar)"> This was not true. </xsl:if>

Returning true and false values

To return a true value (no, not the hardware store), use the true() function:

boolean true()

To return a false value, use the false() function:

boolean false()

Converting to a boolean

You can convert a value to a boolean with the boolean() function. A string and node returns true when it is not empty, whereas a number is true if it is not equal to . The syntax is:

boolean boolean(object)