The basic data roles
for a bubble plot are:
Geography
specifies the geography
data item that identifies geographic regions for your map.
Geography data items
are identified by the
![geography icon](images/gismember.png)
icon.
Bubble size
specifies the measure
that determines the marker size.
In addition to the basic
data roles, you can assign additional roles:
Bubble color
specifies a measure
that determines the bubble color.