This image shows an Expression Builder dialog with following fields:
Expression field containing following value:
/be:business-event/be:content/ns0:Customers/ns0:Customer/ns0:Operation = “update”
Variable list with ns0:Operation element selected.
Functions List with equals function selected.
Content Preview field with ns0:Operation element value.
Description field containing text description of the equals function.
Help, OK, and Cancel buttons.