The valid parts of a map: its elements that can be drawn, with the valid fields of their styles, a valid frame and valid properties. What a file and a link keep: the one form of a map, e.g. to compare two of them.
The valid parts of a map: its elements that can be drawn, with the valid fields of their styles, a valid frame and valid properties. What a file and a link keep: the one form of a map, e.g. to compare two of them.