A dependency is where an item references, and so depends upon, another item in configuration. Any item may possess a number of dependents and, in turn, exhibit dependency upon other items.

In XoomXML, if a parameter depends on an item, this is indicated by the xoom:ref attribute. This takes the value of the Xoom identity of the item to which it points. For example:
<TaskProperty xoom:ref="Task Property[RequiredSkills1]">RequiredSkills1</TaskProperty>