Backward Trace Analysis - Cross-Domain Traceability TEST8

Analysis Metadata

Execution Date: December 16, 2025

Test Case: TEST8 - Consistent xId External Reference Mechanism

Analysis Files:

pdi_0_e5-242.stp - Source STEP AP242 File
pdi_0_e5-242_STEP_UUIDs_TEST8.qif - QIF Plan with UUID References (QPId: d4b965a6-4b90-40b5-9e9e-99aaf09f24dd)
pdi_0_e5-242_Results_TEST8_xIDs.QIF - QIF Results File with Consistent xId External References (QPId: 01569993-9613-43df-82a6-2119d938d823)

Goal: Perform backward trace from ALL characteristics in QIF Results via xId external reference mechanism, ExternalEntityID referencing, and QIF Identifier matching back to STEP source entities.

Traceability Rules Applied: Rules_for_UUID_Relationship_Analyses_v8.txt

🔗 TEST8 Special Feature: Consistent xId External Reference Mechanism

This test case demonstrates QIF's external reference capability using the xId attribute consistently across ALL measurements. The Results file references CharacteristicItems in an external QIF Plan document using:

ExternalQIFReferences: Declares external document with id="101" referencing QPId d4b965a6-4b90-40b5-9e9e-99aaf09f24dd
xId Attribute Pattern: <CharacteristicItemId xId="21">101</CharacteristicItemId>
Interpretation: The element value (101) identifies which external document; the xId attribute (21 or 22) identifies the element ID within that document

Key Feature: All 6 measurements use xId references - this is the complete, consistent implementation of the external reference pattern.

Executive Summary

Traceability Results

Characteristic Types

Total Measurements

6/6

Successful Traces

6/6

xId References

Total Characteristics Defined: 2 (DiameterCharacteristicItem id="21", PositionCharacteristicItem id="22")

Total Measurement Results: 6 (3 parts × 2 characteristics)

Successful Traces: 6/6 (100%)

xId External References Used: 6/6 (100%) - All measurements use consistent xId pattern

Trace Method Used: xId External Reference → ExternalEntityID

Failed Traces: 0

Failed Measurements (Quality): 1 (Position measurement on Part 3 - out of tolerance)

Traceability Assessment: ✓ COMPLETE SUCCESS

xId Reference Resolution - All Measurements

Measurement ID	Type	Part	CharacteristicItemId Element	xId Attribute	Doc Reference	Resolved Target
11	Diameter	Part 1	xId="21" → 101	21	101	Plan: DiameterCharacteristicItem id="21"
12	Position	Part 1	xId="22" → 101	22	101	Plan: PositionCharacteristicItem id="22"
15	Diameter	Part 2	xId="21" → 101	21	101	Plan: DiameterCharacteristicItem id="21"
16	Position	Part 2	xId="22" → 101	22	101	Plan: PositionCharacteristicItem id="22"
19	Diameter	Part 3	xId="21" → 101	21	101	Plan: DiameterCharacteristicItem id="21"
20	Position	Part 3	xId="22" → 101	22	101	Plan: PositionCharacteristicItem id="22"

xId Resolution Process

Step 1: Read CharacteristicItemId element value (101) - this is the ExternalQIFDocument id
Step 2: Look up ExternalQIFDocument id="101" → QPId = d4b965a6-4b90-40b5-9e9e-99aaf09f24dd
Step 3: Match QPId to external Plan file (pdi_0_e5-242_STEP_UUIDs_TEST8.qif)
Step 4: Read xId attribute value (21 or 22) - this is the target element id in the external document
Step 5: Resolve to CharacteristicItem with matching id in Plan file

Main Traceability Table - Backward Trace from QIF Results

Characteristic Name	Results Measurement IDs	xId Reference	Plan Item ID	Plan Nominal ID	External Entity ID	STEP UUID	STEP Entity	Trace Status
Diameter (Linear Size)	11, 15, 19	All: xId="21" → doc 101	21	19	9991	477ccd2d-7740-5cc5-92f2-e1e2deac6b12	DIMENSIONAL_SIZE #165	xId + ExternalEntityID
Backward Trace Path - Diameter: 1. Results: DiameterCharacteristicMeasurement (ids 11, 15, 19) → CharacteristicItemId xId="21" referencing doc 101 2. xId Resolution: External doc id=101 → QPId d4b965a6-4b90-40b5-9e9e-99aaf09f24dd → Plan file 3. Plan: DiameterCharacteristicItem id="21" → CharacteristicNominalId="19", FeatureItemIds=[12] 4. Plan: DiameterCharacteristicNominal id="19" → EntityExternalIds=[9991] 5. Plan: Entity id="9991" → EntityId=477ccd2d-7740-5cc5-92f2-e1e2deac6b12 6. STEP: V5_UUID_ATTRIBUTE('477ccd2d-7740-5cc5-92f2-e1e2deac6b12', UUID_SET_ITEM((#165))) 7. STEP: #165=DIMENSIONAL_SIZE(#256,'diameter') Geometry Trace: FeatureItemId=12 → CylinderFeatureItem → FeatureNominalId=11 → CylinderFeatureNominal → EntityExternalIds=[9990] → UUID aa86a375-f69f-5fb5-8a8f-3e540dff4618 → STEP #297,#299 (ADVANCED_FACE/CYLINDRICAL_SURFACE)
Position (GD&T)	12, 16, 20	All: xId="22" → doc 101	22	20	9989	a8f9c629-f614-5645-84b7-e81560cedd06	GEOMETRIC_TOLERANCE/POSITION #75	xId + ExternalEntityID
Backward Trace Path - Position: 1. Results: PositionCharacteristicMeasurement (ids 12, 16, 20) → CharacteristicItemId xId="22" referencing doc 101 2. xId Resolution: External doc id=101 → QPId d4b965a6-4b90-40b5-9e9e-99aaf09f24dd → Plan file 3. Plan: PositionCharacteristicItem id="22" → CharacteristicNominalId="20", FeatureItemIds=[12] 4. Plan: PositionCharacteristicNominal id="20" → EntityExternalIds=[9989] 5. Plan: Entity id="9989" → EntityId=a8f9c629-f614-5645-84b7-e81560cedd06 6. STEP: V5_UUID_ATTRIBUTE('a8f9c629-f614-5645-84b7-e81560cedd06', UUID_SET_ITEM((#75))) 7. STEP: #75=(GEOMETRIC_TOLERANCE('Position.1','',#760,#256) GEOMETRIC_TOLERANCE_WITH_DATUM_REFERENCE((#74)) POSITION_TOLERANCE()) Geometry Trace: FeatureItemId=12 → CylinderFeatureItem → FeatureNominalId=11 → CylinderFeatureNominal → EntityExternalIds=[9990] → UUID aa86a375-f69f-5fb5-8a8f-3e540dff4618 → STEP #297,#299 (ADVANCED_FACE/CYLINDRICAL_SURFACE) Datum Reference Frame: DatumReferenceFrameId=26 → Datums A (Primary), B (Secondary), C (Tertiary)

Detailed Measurement Results - All Parts

Part #	ActualComponent ID	Measurement ID	Characteristic	xId Reference	Timestamp	Measured Value	Status	Inspection Status
Part 1	13	11	Diameter	xId="21"→101	2025-07-15T15:18:23	10.000 mm	PASS	PASS
Part 1	13	12	Position	xId="22"→101	2025-07-15T15:18:24	0.000 mm	PASS	PASS
Part 2	17	15	Diameter	xId="21"→101	2025-07-15T15:24:24	10.000 mm	PASS	PASS
Part 2	17	16	Position	xId="22"→101	2025-07-15T15:24:25	0.000 mm	PASS	PASS
Part 3	31	19	Diameter	xId="21"→101	2025-07-15T15:25:07	9.999 mm	PASS	FAIL
Part 3	31	20	Position	xId="22"→101	2025-07-15T15:25:09	0.609 mm	FAIL	FAIL

⚠️ Failed Measurement Analysis

Measurement ID 20 (Position) on Part 3:

Measured Value: 0.609 mm
Tolerance: ⌀0.01 mm (Position tolerance from CharacteristicDefinition id="18")
Result: FAIL - Position deviation (0.609) exceeds tolerance zone (0.01 ⌀)
xId Reference: xId="22"→101 - Successfully resolved via external reference
Traceability Status: ✓ Successfully traced - This is a quality failure, not a traceability failure

Complete UUID Mapping Table - STEP to QIF

External Entity ID	STEP UUID	STEP Entity Type	STEP Instance ID	QIF Plan Usage	Referenced By QIF Objects
9991	477ccd2d-7740-5cc5-92f2-e1e2deac6b12	DIMENSIONAL_SIZE	#165	Diameter PMI	DiameterCharacteristicNominal id="19"
9989	a8f9c629-f614-5645-84b7-e81560cedd06	GEOMETRIC_TOLERANCE (Position)	#75	Position PMI	PositionCharacteristicNominal id="20"
9990	aa86a375-f69f-5fb5-8a8f-3e540dff4618	CYLINDRICAL_SURFACE (Geometry)	#297, #299	Hole Cylinder Geometry	CylinderFeatureNominal id="11"
9998	427affa6-ae35-5e83-8002-18fa37cecad1	PRODUCT_DEFINITION_SHAPE	#632	Part Shape Definition	DigitalModel id="9999"
9997	edc2d377-65ac-56f0-b654-5932834935f8	DATUM_FEATURE	#56	Datum A Feature	OtherNonShapeFeatureNominal id="93"
9996	c61ef055-f208-55c2-befc-8a97f1a87289	DATUM_FEATURE	#57	Datum B Feature	OtherNonShapeFeatureNominal id="94"
9995	37feecb0-d21e-5087-908b-d3585a2e2eb6	DATUM_FEATURE	#58	Datum C Feature	OtherNonShapeFeatureNominal id="95"
9994	abeedfe4-90ba-5cfc-b176-3dea41f6fb09	ADVANCED_FACE (Plane)	#298	Datum A Geometry	PlaneFeatureNominal id="5"
9993	5a6db061-8e96-5521-8404-577d99fb78f8	ADVANCED_FACE (Plane)	#302	Datum C Geometry	PlaneFeatureNominal id="6"
9992	1940cba9-e52f-5ee2-9b32-d683f2da6101	ADVANCED_FACE (Plane)	#303	Datum B Geometry	PlaneFeatureNominal id="7"

Datum Reference Frame Traceability

Datum Label	QIF DatumDefinition ID	Precedence	Feature External ID (DATUM_FEATURE)	STEP DATUM_FEATURE UUID	Geometry External ID	STEP Geometry UUID	STEP Face ID
A	23	PRIMARY	9997	edc2d377-65ac-56f0-b654-5932834935f8	9994	abeedfe4-90ba-5cfc-b176-3dea41f6fb09	#298
STEP Verification: • DATUM_FEATURE #56 ('Datum Feature.1') → SHAPE_ASPECT_RELATIONSHIP #53 → DATUM #68 (label='A') ✓ • GEOMETRIC_ITEM_SPECIFIC_USAGE #60 links DATUM_FEATURE #56 to ADVANCED_FACE #298 (PLANE #286) ✓ • QIF FeatureNominalIds: [5, 93] - PlaneFeatureNominal id="5" (geometry), OtherNonShapeFeatureNominal id="93" (DATUM_FEATURE)
B	25	SECONDARY	9996	c61ef055-f208-55c2-befc-8a97f1a87289	9992	1940cba9-e52f-5ee2-9b32-d683f2da6101	#303
STEP Verification: • DATUM_FEATURE #57 ('Datum Feature.2') → SHAPE_ASPECT_RELATIONSHIP #54 → DATUM #69 (label='B') ✓ • GEOMETRIC_ITEM_SPECIFIC_USAGE #62 links DATUM_FEATURE #57 to ADVANCED_FACE #303 (PLANE #290) ✓ • QIF FeatureNominalIds: [7, 94] - PlaneFeatureNominal id="7" (geometry), OtherNonShapeFeatureNominal id="94" (DATUM_FEATURE)
C	24	TERTIARY	9995	37feecb0-d21e-5087-908b-d3585a2e2eb6	9993	5a6db061-8e96-5521-8404-577d99fb78f8	#302
STEP Verification: • DATUM_FEATURE #58 ('Datum Feature.3') → SHAPE_ASPECT_RELATIONSHIP #55 → DATUM #70 (label='C') ✓ • GEOMETRIC_ITEM_SPECIFIC_USAGE #64 links DATUM_FEATURE #58 to ADVANCED_FACE #302 (PLANE #289) ✓ • QIF FeatureNominalIds: [6, 95] - PlaneFeatureNominal id="6" (geometry), OtherNonShapeFeatureNominal id="95" (DATUM_FEATURE)

Statistical Analysis Summary

Characteristic	Study ID	Samples	Average	Min/Max	Std Dev	Cp	Cpk	Assessment
Diameter	32	3	9.9997 mm	9.999 / 10.000	0.000577	37.60	37.35	CAPABLE
Position	26	3	0.203 mm	0.000 / 0.609	0.3516	0.006	-0.238	NOT CAPABLE

Statistical Analysis Observations

Diameter Characteristic: Excellent capability (Cpk = 37.35) - process is very stable with minimal variation
Position Characteristic: Process is not capable (Cpk = -0.238 negative) - indicates process mean is outside specification limits. The high standard deviation (0.3516) relative to the tight tolerance (⌀0.01) makes this process incapable
Root Cause: Part 3's position measurement (0.609 mm) is 60× the tolerance value, indicating a significant alignment or fixturing issue

Traceability Analysis Conclusion

Traceability Success Assessment

Overall Result: 100% SUCCESS - All 6 measurements fully traced to STEP source
Primary Method: xId External Reference → ExternalEntityID
xId Usage: 6/6 measurements (100%) use consistent xId external reference pattern
No Name-Based Traces: ✓ All traces used UUID-based referencing

Detailed Trace Results

Diameter Characteristic (Measurements 11, 15, 19):

QIF Results: DiameterCharacteristicMeasurement → CharacteristicItemId xId="21" → doc 101
xId Resolution: External doc 101 → QPId d4b965a6-4b90-40b5-9e9e-99aaf09f24dd
QIF Plan: DiameterCharacteristicItem id="21" → CharacteristicNominalId="19"
QIF Plan: DiameterCharacteristicNominal id="19" → EntityExternalIds=[9991]
QIF Plan: Entity id="9991" → EntityId=477ccd2d-7740-5cc5-92f2-e1e2deac6b12
STEP File: V5_UUID_ATTRIBUTE → #165=DIMENSIONAL_SIZE(#256,'diameter')
Result: ✓ COMPLETE SUCCESS via xId

Position Characteristic (Measurements 12, 16, 20):

QIF Results: PositionCharacteristicMeasurement → CharacteristicItemId xId="22" → doc 101
xId Resolution: External doc 101 → QPId d4b965a6-4b90-40b5-9e9e-99aaf09f24dd
QIF Plan: PositionCharacteristicItem id="22" → CharacteristicNominalId="20"
QIF Plan: PositionCharacteristicNominal id="20" → EntityExternalIds=[9989]
QIF Plan: Entity id="9989" → EntityId=a8f9c629-f614-5645-84b7-e81560cedd06
STEP File: V5_UUID_ATTRIBUTE → #75=(GEOMETRIC_TOLERANCE POSITION_TOLERANCE)
Result: ✓ COMPLETE SUCCESS via xId

Failed Measurements (Quality Issue, Not Traceability)

Position Measurement id="20" (Part 3): Measured 0.609mm, tolerance ⌀0.01mm → FAIL
xId Reference: xId="22" → 101 correctly resolved
Traceability Status: Fully traced despite quality failure
Root Cause: Manufacturing/alignment issue, not data quality issue

Compliance with Rules_for_UUID_Relationship_Analyses_v8.txt

✓ V5_UUID_ATTRIBUTE namespace-based UUIDs successfully used
✓ ExternalEntityID references properly maintained
✓ DATUM_FEATURE to reference geometry relationships preserved
✓ PMI properly traced to QIF Characteristics
✓ No tessellated or coordinate_list data incorrectly analyzed
✓ MULTI_FILE_ID_REFERENCE_PATTERN: xId external reference correctly resolved for ALL measurements
✓ RESULTS_PLAN_ID_CONSISTENCY: All CharacteristicItemIds successfully resolved via xId
✓ FEATURE_LINKAGE_PRESERVATION: FeatureItemIds properly connected to geometry
✓ DATUM_DUAL_REFERENCE_PATTERN: Each datum has geometric + OtherNonShapeFeatureNominal

Key Observations

Consistent xId Pattern: This updated Results file demonstrates the complete implementation of QIF's external reference capability - ALL 6 measurements use the xId attribute consistently
ExternalQIFReferences: Properly declares the external Plan document with QPId matching, enabling cross-file traceability
xId Semantics: Element value (101) = document reference; xId attribute (21/22) = element ID within that document
Best Practice Demonstrated: Using xId for all measurements provides clear, unambiguous references to external definitions
Dual Reference Pattern: All three datums (A, B, C) correctly implement the dual-reference pattern
STEP GISU Validation: GEOMETRIC_ITEM_SPECIFIC_USAGE entities confirm DATUM_FEATURE to geometry associations