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The fn:true() function (that always returns true) and the fn:false()
function (that always returns false) are examples of XPath functions. You
can get more information about the other XPath functions and XPath syntax
from the online W3C XML Path Language document. For information about the predefined XPath functions, see Predefined XPath mapping functions.
An additional capability provided by the mapping node is the ability to set the value of a target to a WebSphere MQ constant. The expression to set the value looks similar to a function with $mq: used as the prefix.