Feature Types

XFM features can be seen as objects with geometrical and alphanumerical characteristics, where the geometrical part is represented by DGN elements. Unlike plain MicroStation, where you have total freedom when placing graphical elements, in XFM the geometric characteristics of a feature are defined in the schema and enforced during an OpenCities Map session. Once defined, a feature is often referred to by its geometry.

When defining a feature, the following geometry types can be selected:

point-cell: A point feature represented by a cell element
collection-point-cell: A point collection feature represented by cell elements
point-text: A point feature represented by a text element
collection-point-text: A point collection feature represented by text elements
linestring/curve: A linear feature represented by a linestring element
collection-linestring/curve: A linear collection feature represented by linestring elements
polygon: A polygon feature represented by a polygon element
collection-polygon: A polygon collection feature represented by polygon elements
data: A geometry-less feature for storing data

Note: The data feature is an XFM feature that does not contain geometry. This feature may be used to store application settings data. XFM provides no default operations for this feature type and the application must provide custom code to operate on instances of this feature type. A data feature may contain one or more data sub-features. A data feature may only contain other data sub-features.