The element expects in the expr attribute a number which is interpreted as boolean value. If the number is non-zero, the inner nodes of the element are expanded and the condition code is set to true; otherwise the inner nodes are ignored, and the conditon code is set to false.

Level: Control structure

<!ELEMENT ui:ifexpr ANY>

<!ATTLIST ui:ifexpr
          expr CDATA #REQUIRED
>

• expr: An integer number. A non-zero value as considered as true boolean value, and the number zero is considered as false boolean value. The number is usually the result of the evaluation of a bracket expression.

All page body elements may occur as sub elements.

Note that template parameters and bracket expressions within ui:if are unconditionally evaluated. See ui:cond for a discussion of the consequences of this fact.

<ui:ifexpr expr="$[int-gt(n,1)]">
  The result has more than one solution: ...
</ui:ifexpr>