For interactive changing of area features mainly the same operations as for line features are used (see Adding and editing line features). Every feature boundary can be edited as a separate polyline.
The essential distinction of an area feature is that it is necessary to satisfy the requirements of boundary correctness described in the previous paragraph.
One additional possibility of marking feature vertices in the submode Editing vertices should be mentioned. A double click on the vertex or boundary segment causes marking of all vertices of the present boundary of the area feature. If the double click is performed on the internal part of the area feature, all vertices of all boundaries of this feature are marked.
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