The bpelx:append extension in an assign activity enables a BPEL process service component to append the contents of one variable, expression, or XML fragment to another variable's contents. To use this extension, perform one of the following steps at the bottom of the Copy Rules tab:

• For BPEL 1.1, select a copy rule, then select Append from the dropdown list, as shown in Figure 6-31.

• For BPEL 2.0, right-click a copy rule, select Change rule type, and then select Append, as shown in Figure 6-32.