Delete an attribute from an element

Hi Scripters, I know from Russ Ward's samples how to delete an attribute value. But how do I delete the attribute itself from the element? The attribute is undefined in the document's EDD, that is, it shows as red in the structure view. FrameScript has a command for deleting an "undefined" attribute from an element, but I don't see a way to do this in ExtendScript. Any help will be appreciated. -Rick

I see that the FDK has an F_ApiDeleteUndefinedAttribute() function, but I don't see an equivalent in ExtendScript.