Examples on how to Reset a Cross-filter Selection

[Unemyr]

It would be really useful to have an example (or some quick advice) on how to reset one of the Clauses in a cross-filter selection associated with a specific Chart.

In the API it is mentioned that a Selection can be reset this way:
selection.remove(source)
Create a clone of this Selection with clauses corresponding to the provided source removed.

This API sounds exactly right - except that I cannot seem to find in the documentation anywhere where to actually extract the source variable from a vgplot that I create that use this particular selection filter? Maybe I am somehow missing something really rudimental/simple here?

Some generic and possibly common use cases related to this question:

1. A quick button in the UI that allows you to reset a selection for a specific chart view (or all the charts associated with the cross-filter).
2. The ability to add/remove/reload new charts in run-time - this would require the cross-filter Clause for the view that is removed/reloaded to be reset, before it is loaded again or other new views as loaded as it seems that chart's active filter selection will otherwise linger even after the DOM object has been removed.

[Unemyr]

Adding some notes here for future references to others who are looking to do the same thing. This is likely not the best-practice approach to achieve this, but it works.

In order to match the plot to remove the selection from programmatically, I was able to set a unique ID in the attributes setting, that I could match knowing this unique ID in a wrapper component (or some other type of stateful object which is used to generate the vgplot. I would match the unique ID with any source objects that match this ID in the Selection object's source arrays, [object]._value.active as well as all the index references [object]._value[x] (if any).

For discussion - the name() attribute is not listed in the attributes array in internal data structures (for example when reading out a Selection object through [object]._value[x].mark.plot.attributes.name), so using vg.name("my_unique_plot_id") can not be used in the approach above to identify the source associated with the plot to be cleared from a prior selection.
To work around this, I ended up setting a the style attribute for the plor with style: { id: "my_unique_id" } instead. The style attribute does list in internal data structures as an attribute.

Also, feel free to share the recommended best-practice approach for above, if any.