<wd:repeater-action id="add" action-command="add-row" repeater="repeater-id"/> :
when activated, adds a row to the sibling repeater named "repeater-id".
<wd:repeater-action id="rm" action-command="delete-rows" repeater="repeater-id"
select="select-id"/> : removes the selected rows from the sibling repeater named "repeater-id".
The selected rows are identified by the boolean field "select-id" present in each row.