Using the bpelx:append Extension to Append New Items to a Sequence

The bpelx:append extension in an assign activity enables BPEL process service components to append new elements to an existing parent element. The following provides an example.

    <assign name="assign-3">
        <copy>
            <from expression="bpws:getVariableData('idx')+1" />
            <to variable="idx"/>
        </copy>
        <bpelx:append>
            <bpelx:from variable="partInfoResultVar" part="payload" />
            <bpelx:to variable="output" part="payload" />
        </bpelx:append>
        ...
    </assign>

The bpelx:append logic in this example appends the payload element of the partInfoResultVar variable as a child to the payload element of the output variable. In other words, the payload element of the output variable is used as the parent element.