Question on Vega "Zoomable Scatter Plot Example"

Hello All,

I was looking at this example to try to understand how to make my visualization zoomable and panable and in doing that when I try to work with the example in my instance it complains about "xext" and I can't see where that is defined anywhere on the spec, is this built into vega? and if so why would it complain about it for me? I assume I am making a simple mistake but would appreciate some help here.

Thank you!

I found it with experimentation that the "xext" and the "yext" are coming from the transform of type "extent" in the data set.

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