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A relation is a vertical list of objects mapped to a context document. Mapping to a context required going into the properties.
In the properties window:
Type: select context using the type browser.
In the relations box, click under values to open the list of objects that will be attributed based on the selected context. Here, you can add new objects to the list.
This list can be automatically saved locally to a parameter by adding a name to the parameters name field. To use the values outside of the boxed expression document, use the copy value to.