You can run a set of predefined validation rules on an event processor at design time. The validation rules include:
An event processor must have at least one input operator.
An event processor must have at least one output operator.
All of an operator's required properties must have values.
If an attribute has a data type of VARCHAR, then the size must also be specified.
In the NetBeans IDE, open the event processor that you want to validate.
Click the Validate XML icon at the top of the Design view.
The results appear in the Output window.
If you switch to the Source view and click a validation error in the Output window, then the source of the error is highlighted.