## 3 Results  
The proposed information exchange between models supporting construction processes, based on the IFC standard, and models supporting the transportation sector, conceptually based on the Transmodel, is demonstrated using a train station example (Figure 5). The station has two stop places--a bus stop place and a rail stop place--which allow transferring from bus to train and vice versa. The bus stop place has one physical stop point (quay) and the rail stop place has three physical stop points (quays as platforms 1, 2, and 3) where passengers can board and alight the public transportation. According to the NeTEx schema, the geometry and topology of the station is described with the _STOP PLACE_, _QUAY_, and _ACCESS SPACE_ entities contained in the _SITE_ entity. The quays and access spaces are physical areas of different types (forecourt, booking hall, rail platform, underpass) within a stop place. Each physical area has a location, coordinates, a site level, and locations for equipment placement. Various pieces of equipment may be located within the equipment place, such as location signs, general entrance/exit signs,  
Figure 4: Correspondence between IFC and Transmodel classes. elevators, escalators, stairs, passenger safety equipment, crosswalks, aid station equipment, passenger information equipment, wheelchair access equipment, etc. The equipment is linked to services provided at the stop place (customer service, assistance service, complaint service, lost and found service, rental service, etc.). Accessibility information in NeTEx supports assessment of mobility-impaired access for passengers with information requirements for accessibility constraints to stop place facilities and equipment, for example, whether a stop place has escalator-free access, is wheelchair accessible, etc. The information can be specified for all physical stop place components such as quays and access spaces. The code in the Appendix A shows the NeTEx XML description of the bus stop at the train station, which has a quay with a covered shelter (Figure 1). For the quay, passenger accessibility information is also presented. The _STOP PLACE_ also contains a list of vertical levels. In the bus stop at the station, only a ground level is defined and referenced in the quay for the outdoor shelter equipment. Since the bus stop place has only a simple shelter, no entrances are specified. The rail stop place has one entrance (_STOP PLACE ENTRANCE_) to the ticket hall, one entrance to platform 1, one entrance to the underpass, and one entrance to platforms 2 and 3. The NeTEx code snippet in Appendix B is part of the previous full NeTEx XML description of the station (Figure 1) and shows the stop place entrance to Platform 1 from the main ticket hall. The entrance groups objects of the place equipment, in this case a door (_ENTRANCE EQUMENT_) with its width (2.5) and height (2.5) and a ramp (_RAMP EQUIPMENT_) for easy access. The entrance maintains a spatial connection (_ParentZoneRef_ = 2 PoAd54s5 oHvjLoo2 LucUD) to the ticket hall, which is the associated access area. The level of the entrance is the first floor (LevelRef = 1 oZ0 wPs_PE8 ANCPg3 bIs4j  
Figure 5: The train station site with two stop places: NeTEx elements identification. Platforms 1 and 2, both quays, are accessible through the underpass (access space). The path from the ticket hall leads over two staircases. In NeTEx, a staircase (_STAIRCASE EQUIPMENT_) is modelled as follows:  
<StaircaseEquipment version=\"any\" id=\"law5 Ew3 smvp38 Khn3 Oeyu2E\">  <Name>Staircase l</Name>  <Width>3x/Width>  <Depth>3_9</Depth>  <NumberOfsteps>24</NumberOfSteps>  <StepHeight>l6</StepHeight>  <HandrailType>none</HandrailType>  <SpiralStairyfalse</SpiralStairy>  </StaircaseEquipment>  
The staircase contains attributes with information about the width and height in space, the number of steps, the height of a step, the presence of a handrail (used as a support when using the stairs), a riser (the vertical part of the step), and the stair shape (straight or spiral).