The First Element Found
If there are no native
features found when a DGN is opened,
OpenCities Map will look at the first
element on each level and set the feature class type to match that element .
For example, if there is a line and a polygon on a level called Schools, and
the line was the first element placed, the feature class is set to line. If the
feature class is incorrect for non-native features, you may need to analyze the
level and ensure that all elements are of the same type.