Relationships

Node classes are the vertices of the Atlas graph. These object properties are the edges. Each has a typed domain and range — Atlas’s SHACL shapes enforce them, so a fact that violates a domain or range fails ingestion before it lands.

The diagram below is a single plan’s traversal through the graph. Every edge labeled on the diagram appears in the tables underneath; pick any row and trace the corresponding edge here.

A plan traversal — six named edges, every one documented in the table above.

Artifact and document edges

Edges that tie SAP artifacts, their documentation, and their context together.

Edge	Domain	Range	Meaning
`atlas:hasSection`	`atlas:Document`	`atlas:DocumentSection`	A document is composed of sections.
`atlas:belongsToModule`	`atlas:SAPArtifact`	`atlas:SAPModule`	An artifact lives in a functional module (FI, MM, SD).
`atlas:hasVersionScope`	`atlas:SAPArtifact`	`atlas:VersionScope`	An artifact is scoped to a product + release.
`atlas:references`	`atlas:Document`	`atlas:SAPArtifact`	A document mentions an artifact.
`atlas:supportedByStatement`	(any)	`atlas:DocumentSection`	Links any derived claim back to the exact document section that supports it. The evidence-trail substrate.

Supersession edges

The supersedes / replacedBy pair models “X replaces Y” as an inverse relationship, so queries can traverse in either direction.

Edge	Domain	Range	Inverse of
`atlas:supersedes`	`atlas:SAPArtifact`	`atlas:SAPArtifact`	—
`atlas:replacedBy`	`atlas:SAPArtifact`	`atlas:SAPArtifact`	`atlas:supersedes`

Guidance edges

How derived guidance points at artifacts and the documents that justify it.

Edge	Domain	Range	Meaning
`atlas:guidesFrom`	`atlas:Guidance`	`atlas:SAPArtifact`	The source side of a guidance path (the thing being migrated away from).
`atlas:guidesTo`	`atlas:Guidance`	`atlas:SAPArtifact`	The target side (the thing being migrated to).
`atlas:citesDocument`	`atlas:Guidance`	`atlas:Document`	The document that backs a piece of guidance.

Version-scope edges

How version-scope nodes bind to products and releases.

Edge	Domain	Range	Meaning
`atlas:validForProduct`	`atlas:VersionScope`	`atlas:SAPProduct`	This scope applies to this product.
`atlas:validForRelease`	`atlas:VersionScope`	`atlas:SAPRelease`	This scope applies to this release.

Plan edges

The dependency graph Atlas emits for a task is a set of plan steps linked by these edges.

Edge	Domain	Range	Meaning
`atlas:hasStep`	`atlas:Plan`	`atlas:PlanStep`	A plan contains plan steps.
`atlas:dependsOnStep`	`atlas:PlanStep`	`atlas:PlanStep`	A step requires another step to complete first.
`atlas:involvesArtifact`	`atlas:PlanStep`	`atlas:SAPArtifact`	A step operates on an SAP artifact.
`atlas:basedOnTemplate`	`atlas:Plan`	`atlas:PlanTemplate`	A plan was instantiated from a template.

Case and bundle edges

How engineering cases relate to each other, to the bundles Atlas emits, and to the governance signals that can block them.

Edge	Domain	Range	Meaning
`atlas:recommendsPattern`	`atlas:Recommendation`	`atlas:Pattern`	A recommendation endorses a modernization pattern.
`atlas:generatedFrom`	`atlas:BundleArtifact`	`atlas:EngineeringCase`	A bundle is the output of a case.
`atlas:similarToCase`	`atlas:EngineeringCase`	`atlas:EngineeringCase`	Links to prior similar cases — drives calibration.
`atlas:blockedBy`	`atlas:EngineeringCase`	`atlas:RiskSignal`	A risk is gating a case.
`atlas:usesReleasedApi`	`atlas:BundleArtifact`	`atlas:ReleasedAPI`	A bundle depends on a released SAP API.
`atlas:needsWrapper`	`atlas:BundleArtifact`	`atlas:WrapperRequirement`	A bundle requires an adapter Atlas has identified.

Estimate edges

How forecasts link to the cases they cover and to observed outcomes.

Edge	Domain	Range	Meaning
`atlas:estimatedBy`	`atlas:EngineeringCase`	`atlas:EstimateSnapshot`	A case has an estimate snapshot.
`atlas:calibratedAgainst`	`atlas:EstimateSnapshot`	`atlas:DeliveryOutcome`	An estimate was calibrated against an observed outcome.

Governance edges

Edge	Domain	Range	Meaning
`atlas:resolvedBy`	`atlas:RiskSignal`	`atlas:MigrationDecision`	A risk is cleared by a recorded decision.

SAP source-intelligence edges (`sap:` prefix)

The detailed CDS / OData sub-graph. These are the edges Atlas’s planner walks when picking a binding for a generated view.

Edge	Domain	Range	Meaning
`sap:hasField`	`sap:CDSView`	`sap:CDSField`	A view has a field.
`sap:hasKeyField`	`sap:CDSView`	`sap:CDSField`	A field is part of the view’s semantic key.
`sap:hasMeasureField`	`sap:CDSView`	`sap:CDSField`	A field is a measure (only on analytical cubes).
`sap:hasCurrencyField`	`sap:CDSView`	`sap:CDSField`	A field carries currency semantics.
`sap:hasAssociation`	`sap:CDSView`	`sap:CDSAssociation`	A view declares an association.
`sap:targetsView`	`sap:CDSAssociation`	`sap:CDSView`	An association points at its target view.
`sap:hasReleaseContract`	`sap:CDSView`	`sap:ReleaseContract`	A view is bound to a C0 / C1 / C2 contract.
`sap:exposedByService`	`sap:CDSView`	`sap:ODataService`	A view is exposed via an OData service.
`sap:mapsToEntitySet`	`sap:CDSView`	`sap:EntitySet`	A view backs a specific entity set.
`sap:observedBy`	`sap:CDSView`	`sap:TenantObservation`	Confirmed to exist in a customer tenant.
`sap:supersededByView`	`sap:CDSView`	`sap:CDSView`	This view has a successor — the planner prefers the successor.
`sap:contradicts`	(any)	(any)	Flags a fact that conflicts with another — raised by the validator.

The provenance edge

The single most-traversed edge in the whole graph. Every instance Atlas writes has at least one of these.

?claim atlas:supportedByStatement ?section .
?section atlas:sourceURL ?url .
?section atlas:fetchedAt ?ts .

When a reviewer opens atlas evidence, the printed output is the traversal across that edge, plus the document properties the section is attached to.