A validate activity is used to validate the values of variables against their associated XML and WSDL data definition. The construct has a "variables" attribute, which points to the variables being validated.
Syntax:
<validate variables="BPELVariableNames" standard attributes>
standard-elements
</validate>
Mapping
You design a validate activity using a process object with a <<validate>> stereotype, which triggers the display of the Validated Variables tab.