The fill data type owns four properties. The first one is a string which defines the type of the fill. The allowed values for type are "no_fill", "hatching", "pattern" and "color".

The second property is a ColorSpec called colSpec (see ColorSpec).

The third property defines the hatching used. Values allowed for this property are the names of all existing hatchings as string.

The fourth property is used for defining the type of pattern. Allowed values for that property are the names of all existing patterns as string.