Function to check if an object is an xpssFrame, or coerce it to one if possible.
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any (non-empty) R object.
as.xpssFrame returns an xpssFrame, with the essential attributes
WEIGHTS for the actual dataset and additional variable.label and varname attributes for every variable in the dataset.
is.xpssFrame returns TRUE if its argument is a xpssFrame (that is, has "xpssFrame" amongst its classes) and FALSE otherwise.
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