According to the Sharepoint SDK:
Column Element (View)
Returns the raw data value for a particular field, as opposed to the formatted version provided by the Field element. In the case of a Lookup field, Column returns the local value (an ID number in the list that references another list), while the LookupColumn element returns the data from the foreign table.
They failed to mention that the output will be empty if the specified column is not included in the containing view already! Seems like a bug / undocumented issue to me.
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