${ELEMENT, "List of System Use Cases", "UseCase", LoopInElement, PROPERTY=name}
${ELEMENT, "List of Elements (Any type)", , LoopInElement, PROPERTY=name}
In the first example, the name of the children use cases of selected element will be output. Note that "List of System Use Cases" is the field name,which is a required and unique value for identifying this field.
In the second example, the name of all children elements of selected element will be output.
When you pick-up a Doc Base with such an ${ELEMENT} field in it, you can select the model element to query in Doc. Composer.