BC003 ALX3a - initial PR

tests/BC003_ALX3a/readme.md

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+# 5 Stationing tests on nodes - BC003-ALX3a
+
+| Test code  | Test author     | Test dataset source | Test direction |
+|------------|-----------------|---------------------|----------------|
+|BC003-ALX3a | Joao Correa     | MINnD               | Import/Export  |
+
+
+## Intent
+
+This Test belongs to a series of Tests that share a dataset from the same project as a business case. 
+The series of tests that belong to this Business Case are listed as follows:
+
+| Test code | Test name     | 
+|-----------|-----------------|
+| PS01      | Project setup with georeferencing |
+| AL01      | Multiple alignments of railway line |
+| RR01      | Railway track elements validation |
+| ALX1      | Stationing tests on equipment (punctual)|
+| ALX2      | Stationing tests on nodes (punctual) |
+| **ALX3a**     | **Alignment reference check on linear elements (early design)** |
+| ALX3b     | Alignment reference check on linear elements (detailed design, precast) |
+| ALX3c     | Alignment reference check on linear elements (detailed design, case-in-place) |
+| NE01      | Network integrity/continuity check on linear elements |
+| ALX4      | Stationing tests on cable joints (punctual) |
+| NE02      | Cable routing |
+
+## IFC concepts involved in this test
+
+The following test intends to address the use case where the cable infrastructure is in concrete, following the tracks:
+![ALX3a - cabling infrastructure](./BC003_ALX3a_cabling_infrastructure.jpg)
+
+
+The following diagram represents the rationale used for this test: the cabling supporting structure follows the track alignment shifted from varying distances.
+![ALX3a - rationale](./BC003-ALX3a_rationale.png)
+
+The cabling supporting structure is represented by a swept volume using the following 2D profile:
+![ALX3a - 2D profile](./BC003-ALX3a_2Dprofile.png)
+
+
+The following diagram represents the entities involved in this test.
+![ALX3a - involved entities](./BC003_ALX3a_diagram.png)
+
+## Prerequisites
+
+The test plan builds upon the previous test plans. All requirements presented in previous test plans must be met.
+
+## Test dataset (input)
+
+This test case utilises the dataset collected in the Dataset folder and is summarised in the table below. **For more details on each item see [Dataset description](Dataset/README.md).**
+
+
+In addition, the outcome of the previous tests shall be used as input of this test.
+
+## Validation criteria
+
+:zap: For this test case to be considered passed, **all criteria listed in this section**, and **the ones of prerequisites tests** shall be verified. :zap:
+
+### Formal rules
+
+#### IFC standard (schema and specification)
+
+When validated using the bSI Validation Service, the IFC must pass:
+
+- Syntax & Schema check
+
+
+#### Test case-specific checks
+
+:hourglass:
+
+#### Not covered by the IDS file (must be checked otherwise):
+
+:hourglass:
+
+### Informal criteria
+
+Open questions:
+- Should we use some `IfcRelNests` relationship between Alignments?
+- Some Concept Template seems required in order use `IfcRelPositions` to link the cable carrier to the alignment?
+- The cable carrier needs to be spatially contained in the IfcRailway, but is located w.r.t. some alignment. Does it introduce some potential inconstistancy?  
+
+### Expected geometry
+
+![Expected Geometry - extruded cabling support](./BC003_ALX3a_extruded_cabling_support.png)
+
+
+### Control parameters
+
+The following steps should be performed in order to corroborate that the software is working as expected.
+
+:hourglass:
+
+
+## Link to requirements
+
+|ID (local)	| Name | Description | Requirements for Appointed Party |
+|-|-|-|-| 
+| RI 86 | Unique containment | "Each IfcElement shall be either: - contained in one and only one IfcSpatialStructureElement, or - contained in one and only one IfcLinearPositioningElement." | RA-75 |
+| RI 311 | Alignement extruded geometry placement | A IfcCableCarrierSement which geometry is a IfcSectionSolidHorizontal  shall be using the same IfcObjectPlacement as the IfcAlignment it is positioned along | NIL|
+| RI 312 | Offset alignment placement | An IfcAlignment which geometry is a IfcOffsetCurveByDistances shall use the same IfcLocalPlacement as the IfcAlignment is relates to | NIL|
+| RI 313 | Extruded CableCarrier positioning | A IfcSectionedSolidHorizontal geometry used for a IfcCableCarrierElement  positioned relatively from an IfcAlignment shall use its IfcLocalPlacement | NIL |
+| RI 314 | Project structure | The only "container" aggregated to the project shall be either IfcSite, IfcFacility, IfcAlignment. Other non-IfcProducts shall be connected to the project with IfcRelDeclares | NIL |
+| RI 315 | Elements referencing in Spatial structures | If IfcElements are positioned wrt IfcPositioning elements, then they must be also referenced (instead of aggregated) into a IfcSpatialStructure element | NIL |
+