Type describing the thematic and geometric attributes and the associations of bridges. It is an abstract type, only its subclasses Bridge and BridgePart can be instantiated. An _AbstractBridge may consist of BridgeParts, which are again _AbstractBridges by inheritance. Thus an aggregation hierarchy between _AbstractBridges of arbitrary depth may be specified. In such an hierarchy, top elements are Bridges, while all other elements are BridgeParts. Each element of such a hierarchy may have all attributes and geometries of _AbstractBridges. It must, however, be assured that no inconsistencies occur. The name will be represented by gml:name (inherited from _GML) The lodXMultiSurface must be used, if the geometry of a bridge is just a collection of surfaces bounding a solid, but not a topologically clean solid boundary necessary for GML3 solid boundaries. Denotes the relation of an _AbstractBridge to its bridge parts. The BridgePartPropertyType element must either carry a reference to a BridgePart object or contain a BridgePart object inline, but neither both nor none. A BridgeInstallation is a part of a Bridge which has not the significance of a BridgePart. Examples are stairs, etc. As subclass of _CityObject, a BridgeInstallation inherits all attributes and relations, in particular an id, names, external references, generic attributes and generalization relations. Denotes the relation of an _AbstractBridge to its bridge installations. The BridgePBridgeInstallationPropertyTypeartPropertyType element must either carry a reference to a BridgeInstallation object or contain a BridgeInstallation object inline, but neither both nor none. An IntBridgeInstallation is an interior part of a Bridge which has a specific function or semantic meaning. Examples are interior stairs, railings, radiators or pipes. As subclass of _CityObject, an IntBridgeInstallation inherits all attributes and relations, in particular an id, names, external references, generic attributes and generalization relations. Denotes the relation of an _AbstractBridge to its interior bridge installations. The IntBridgeInstallationPropertyType element must either carry a reference to a IntBridgeInstallation object or contain a IntBridgeInstallation object inline, but neither both nor none. Type describing the thematic and geometric attributes and the associations of bridge construction elements. The name will be represented by gml:name (inherited from _GML) The lodXMultiSurface must be used, if the geometry of a building is just a collection of surfaces bounding a solid, but not a topologically clean solid boundary necessary for GML3 solid boundaries. Denotes the relation of an _AbstractBridge to its bridge construction elements. The BridgeConstructionElementPropertyType element must either carry a reference to a BridgeConstructionElement object or contain a BridgeConstructionElement object inline, but neither both nor none. A BoundarySurface is a thematic object which classifies surfaces bounding a bridge or a room. The geometry of a BoundarySurface is given by MultiSurfaces. As it is a subclass of _CityObject, it inherits all atributes and relations, in particular the external references, the generic attributes, and the generalization relations. Denotes the relation of an _AbstractBridge to its bounding thematic surfaces (walls, roofs, ..). The BoundarySurfacePropertyType element must either carry a reference to a _BoundarySurface object or contain a _BoundarySurface object inline, but neither both nor none. There is no differentiation between interior surfaces bounding rooms and outer ones bounding bridges (one reason is, that ClosureSurfaces belong to both types). It has to be made sure by additional integrity constraints that, e.g. an _AbstractBridge is not related to CeilingSurfaces or a room not to RoofSurfaces. Denotes the relation of an _BondarySurface to its openings (doors, windows). The OpeningPropertyType element must either carry a reference to an _Opening object or contain an _Opening object inline, but neither both nor none. Type for openings (doors, windows) in walls. Used in LoD3 and LoD4 only. As subclass of _CityObject, an _Opening inherits all attributes and relations, in particular an id, names, external references, generic attributes and generalization relations. Type for windows in walls. Used in LoD3 and LoD4 only . As subclass of _CityObject, a window inherits all attributes and relations, in particular an id, names, external references, generic attributes and generalization relations. Type for doors in walls. Used in LoD3 and LoD4 only . As subclass of _CityObject, a Door inherits all attributes and relations, in particular an id, names, external references, generic attributes and generalization relations. A Room is a thematic object for modelling the closed parts inside a Bridge. It has to be closed, if necessary by using closure surfaces. The geometry may be either a solid, or a MultiSurface if the boundary is not topologically clean. The room connectivity may be derived by detecting shared thematic openings or closure surfaces: two rooms are connected if both use the same opening object or the same closure surface. The thematic surfaces bounding a room are referenced by the boundedBy property. As subclass of _CityObject, a Room inherits all attributes and relations, in particular an id, names, external references, generic attributes and generalization relations. Type for bridge furnitures. As subclass of _CityObject, a BridgeFurniture inherits all attributes and relations, in particular an id, names, external references, generic attributes and generalization relations. Denotes the relation of an _AbstractBridge to its rooms. The InteriorBridgeRoomPropertyType element must either carry a reference to an BridgeRoom object or contain an BridgeRoom object inline, but neither both nor none. Denotes the relation of a BridgeRoom to its interior bridge furniture. The InteriorBridgeFurniturePropertyType element must either carry a reference to an BridgeFurniture object or contain an BridgeFurniture object inline, but neither both nor none.