4.1.4.4.1.1 Alignment Layout - Horizontal, Vertical and Cant

Nesting relationships between IfcAlignment and the three layouts, with respective segments, that may define it (i.e., IfcAlignmentHorizontal, IfcAlignmentVerticalSegment, IfcAlignmentCant).

When defining the list of segments for the business logic (i.e., IfcAlignmentHorizontalSegment, IfcAlignmentVerticalSegment, IfcAlignmentCantSegment):

A zero-length segment shall be added, at the end of the list of segments for IfcAlignmentSegment.DesignParameters.
If the geometry definition is also present, then each of the zero-length segments shall have a IfcCurveSegment counterpart - of length zero.

The following diagram shows the generic classes and relationships used when applying this concept. In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the table below shows a recommended list of general usage patterns that users may adopt.

Figure 4.1.4.4.1.1.A

General Usage

ApplicableEntity
IfcAlignment

Table 4.1.4.4.1.1.B