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Here is a smaller
subset of the most important database classes, i.e. non-geometrical classes,
that appear in a typical Revit model programming task. The red classes are
the most commonly used. The RoofBase class and its derived types
FootPrintRoof and ExtrusionRoof were added in Revit 2009. In the model, we
see the host and component objects, such as windows and doors. These are
actually instances of types. The family base and family are used to manage
collections of related types. Symbol is a base class for all types, also
known as symbols. Family symbol is the generic class for these, whereas wall
and floor type are more specialised classes. Family instance represents an
occurrence or usage instance of a generic family symbol, whereas wall and
floor represent the same for a wall or floor type.
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