boolean_and

Description:

Returns the string true if all parameters are equal to true (not
case sensitive), otherwise the string false.

Syntax:

Two to n parameters: Boolean values to be linked with the Boolean AND

Example:

<operation name="boolean_and">
..<constant>truE</constant>
..<constant>True</constant>
..<constant>TRUE</constant>
</operation>

Return value:

true
As soon as a value is found that is not true, false is returned. Any subsequent values are not checked. If no value can be determined for one of the parameters checked, nothing is returned.