Premises / Spatial Unit
Describe a persistent bounded interior space through identity, temporal containment, geometry, measured properties, qualified use and spatial succession.
Bundle → Layer → Finding → Questions Filled
6 bundles · 12 layers · 12 findings · 36 questions
Identity and interpretation Recognize one governed interior-space entity and its representational scope.
Persistent spatial identity
One governed interior-space entity survives label changes and corrected representations. Matching remains provisional until the spatial governance authority confirms it.
Persistent spatial identity
One governed interior-space entity survives label changes and corrected representations. Matching remains provisional until the spatial governance authority confirms it.
- Which authoritative spatial identifier and namespace distinguish this unit from similarly numbered rooms? identity
- What makes this instance a premise, room, corridor or other bounded interior unit rather than a building, address or item? classification
- Which evidence confirms that a renumbered label denotes the same unit rather than a successor? provenance
Purpose and representation profile
Choose the interpretation of this unit explicitly. Legal, operational and navigation representations can overlap without being identical entities.
Purpose and representation profile
Choose the interpretation of this unit explicitly. Legal, operational and navigation representations can overlap without being identical entities.
- Which interior-space profile establishes the unit extent and intended modelling purpose? definition
- Which source object is an exact match, partial overlap or representation of this unit? interoperability
- How is an open-plan or partly bounded space identified when no complete wall enclosure exists? exception
Delineation and geometry Separate boundary assertions from revisioned coordinate representations.
Boundary assertions
Record each asserted delimiter and its interpretation. Surveyed, designed, inferred and declared extents remain distinguishable; legal delimitation is an external assertion.
Boundary assertions
Record each asserted delimiter and its interpretation. Surveyed, designed, inferred and declared extents remain distinguishable; legal delimitation is an external assertion.
- Which physical or virtual delimiters define the selected boundary revision? spatial
- Who asserted or approved this boundary and what evidence limits that authority? authority
- How are conflicting survey, design and registered boundary representations preserved and resolved for this use? quality
Geometry and placement
Geometry is a revisioned representation, not the entity identifier. Preserve coordinate frame and transformation evidence; never compare raw coordinates from incompatible frames.
Geometry and placement
Geometry is a revisioned representation, not the entity identifier. Preserve coordinate frame and transformation evidence; never compare raw coordinates from incompatible frames.
- Which footprint or volume, coordinate reference frame and placement chain describe this unit revision? spatial
- What tolerances and vertical reference govern the elevation and extent representation? measurement
- Which geometry checks failed or remain unknown for closure, self-intersection, frame transformation and boundary consistency? validation
Measurements and observation Retain physical properties, measurement basis and qualified observations.
Area and volume assertions
Measurements retain their definition and basis. Planned area, measured area, gross area, net area and rentable area cannot be silently substituted or summed.
Area and volume assertions
Measurements retain their definition and basis. Planned area, measured area, gross area, net area and rentable area cannot be silently substituted or summed.
- Which area, volume, perimeter or height value is asserted under which named measurement definition? measurement
- Which inclusions, exclusions, headroom treatment and shared-area allocation apply to this quantity? constraint
- What prevents double counting when parent, child and shared-space quantities are compared? quality
Recognition and observation evidence
A plan label, survey or sensed result is evidence about a unit at a time. Recognition does not prove current occupancy, current geometry or permission.
Recognition and observation evidence
A plan label, survey or sensed result is evidence about a unit at a time. Recognition does not prove current occupancy, current geometry or permission.
- Which observation or drawing supports recognition of the unit at the stated time? evidence
- When did the observed condition apply, when was its result produced and when was it ingested? temporal
- What uncertainty, coverage limits or staleness prevents this observation from being treated as a current fact? quality
Spatial context Maintain time-scoped decomposition, adjacency and independently identified common spaces.
Effective spatial containment
A parent-child edge denotes spatial decomposition in a declared profile and effective interval. It is distinct from ownership, a mailing address or an overlapping group.
Effective spatial containment
A parent-child edge denotes spatial decomposition in a declared profile and effective interval. It is distinct from ownership, a mailing address or an overlapping group.
- Which parent unit or containing building resolves this unit in the selected decomposition and time interval? composition
- Would this containment change create a cycle, conflicting active parents or a child outside the asserted extent? validation
- How is an unresolved building binding or a multi-storey unit represented without inventing another unit? exception
Adjacency and shared-space relationships
Adjacent spaces, possible passages, shared-space use and grouping are different relationships. None grants physical entry or implies co-ownership.
Adjacency and shared-space relationships
Adjacent spaces, possible passages, shared-space use and grouping are different relationships. None grants physical entry or implies co-ownership.
- Which adjacent units and connecting boundary references support a possible passage? relationship
- Which external access or accessibility assessment qualifies use of a connection at the relevant time? access
- Which common spaces or non-spatial groups relate to this unit without changing its spatial identity? composition
Use and occupancy context Qualify use and optional occupancy references without taking over rights or party records.
Designated and observed use
Separate design intention, operational designation, observed activity and externally asserted permitted use. A classification label is not an approval or compliance certificate.
Designated and observed use
Separate design intention, operational designation, observed activity and externally asserted permitted use. A classification label is not an approval or compliance certificate.
- Which design or operational use codes apply under which scheme and effective interval? classification
- Which external decision supports a permitted-use assertion and what scope or unresolved conditions limit it? authority
- How does the observed use differ from the designated use without automatically declaring a legal violation? state
Occupancy and located-item references
Optional context links describe who or what is associated with the unit. Presence, occupation, tenancy, custody and title are not interchangeable and may overlap.
Occupancy and located-item references
Optional context links describe who or what is associated with the unit. Presence, occupation, tenancy, custody and title are not interchangeable and may overlap.
- Which independently mastered occupancy or item-location assertion refers to this unit and with what basis? relationship
- Which occupation intervals or presence observations overlap, remain open or have uncertain endpoints? temporal
- Which authorized purpose and recipient scope allow disclosure of occupancy or location context? privacy
Continuity and governance Preserve identity decisions, lineage, responsible roles and controlled exchange.
Lifecycle and split or merge lineage
Record spatial establishment, correction, subdivision, merger and retirement distinctly. A local record change cannot construct, demolish or legally register a space.
Lifecycle and split or merge lineage
Record spatial establishment, correction, subdivision, merger and retirement distinctly. A local record change cannot construct, demolish or legally register a space.
- Is this unit proposed, established, unavailable, superseded or retired, and which evidence supports that state? lifecycle
- Which predecessor and successor identities describe a split or merge, and which identity-continuity policy applies? event
- Does the change correct a representation, alter the unit extent or create a successor, and what dependent links need review? decision
Stewardship, exchange and record continuity
A spatial governance authority governs local assertions. Rights holders, survey authors and data custodians retain separate roles; source attribution alone confers no authority.
Stewardship, exchange and record continuity
A spatial governance authority governs local assertions. Rights holders, survey authors and data custodians retain separate roles; source attribution alone confers no authority.
- Which role governs spatial identity and revisions, and which external records determine property rights or data custody? ownership
- Which versioned exchange mapping preserves identity, geometry basis, measurement definition and unknown values? interoperability
- Which retention, hold and disposal decisions govern plans, occupancy links and retired-unit evidence? retention
Classifiers Filled
- Family
- World Models
- Category
- Physical world and living systems
- Entry kind
- entity
- Navigation path
- NAV.PHY.BLT.UNT
- Domain
- PHY.BLT.UNT
- Industry
- Cross-industry
- Tags
- premisesspatialunitphy.blt.unt
- Also called
- U2
What it is Filled
One independently identified bounded interior space, including a premise, room or shared circulation space. Delimitation may be physical or virtual. A unit can contain subordinate units but remains an entity, not a portfolio, building shell, legal title or navigation engine. All proposed operations affect local records only.
In scope
- Governed identity, interpretation profile, delineation and revisioned geometry
- Measured and planned quantities, recognition evidence and quality
- Effective spatial containment, adjacency, shared-space and optional external occupancy/use bindings
- Correction, split/merge lineage, retirement and role-based record governance
Out of scope
- Building shell identity, lifecycle, structural elements and structural geometry
- Generalized place/address and physical-item identity, custody or ownership masters
- Property rights, tenancy, party identity, condominium quota computation, valuation and legal registration
- Survey certification, building safety certification, navigation execution, access control actuation and physical works
Why it exists Filled
Describe a persistent bounded interior space through identity, temporal containment, geometry, measured properties, qualified use and spatial succession.
Distinguishing features Derived, awaiting review
- Unlike WM-BLT-001 Building / Structure: Reference the building master. Interior extent geometry is local; shell and structural-element geometry remain building-owned. A nested unit can resolve its building transitively.
- Unlike WM-BLT-002 subordinate spatial units: Self-type CHILD link implements candidate CONTAINS with distinct instance identities, effective intervals and acyclic same-profile decomposition.
- Unlike WM-PLC-010 generalized place/address: Location and address bindings provide context; neither a label nor a postal address identifies the unit by itself.
- Unlike WM-OBJ-001 Physical Item: Items located in or bounding a unit retain their own masters. Location is neither composition nor ownership.
- Unlike Tenure, occupancy, approval and navigation models: Keep legal and operational assertion masters external. Local bindings and spatial interpretations do not grant rights or operate navigation.
Note: Derived from boundary notes against neighbouring models.
What robots and AI may and may not do Derived, awaiting review
Must not
- Never infer legal title, planning approval, safe entry or emergency suitability from a spatial record.
- Deny disclosure unless recipient, purpose and scope are authorized.
Only with a human decision
- Access requires an applicable evidenced policy basis; consent is neither assumed nor imposed as the only possible basis.
May
- Resolve spatial identity: Proposed local operation, not an implemented runtime. Assess source identifiers and aliases without automatically merging records.
- Register boundary evidence: Proposed local operation, not an implemented runtime. Attach a new boundary/geometry assertion after evidence and frame checks.
- Compare spatial quantities: Proposed local operation, not an implemented runtime. Compare only compatible quantity definitions and geometry revisions.
- Assess containment change: Proposed local operation, not an implemented runtime. Check the proposed time-scoped hierarchy before accepting a local edge.
- Record spatial succession: Proposed local operation, not an implemented runtime. Represent an evidenced correction, split, merger or retirement under the adopted identity policy.
- Produce authorized spatial view: Proposed local operation, not an implemented runtime. Select only permitted geometry and context for a named purpose.
Note: Derived from functions, policies, CRUD and access rules; prohibitions were not authored for agents as such.
Moral aspects Derived, awaiting review
- Access requires an applicable evidenced policy basis; consent is neither assumed nor imposed as the only possible basis.
- Building, child, place and item boundaries reconciled with the ledger; rights and occupancy externally mastered.
- Self-type CHILD link implements candidate CONTAINS with distinct instance identities, effective intervals and acyclic same-profile decomposition.
Note: Sentences mentioning harm, privacy, consent or similar, collected from the specification.
Owners Filled
Steward
Spatial governance authority role and evidenced delegation
Roles
- Spatial governance authority
- Approve identity policy, spatial profile and material local identity decisions.
- Spatial record custodian
- Maintain evidence bindings, revisions and master-system resolution.
- Survey or geometry reviewer
- Assess frame, extent, measurement basis and uncertainty without claiming unrelated legal authority.
- Access and records officer
- Authorize recipient scope, retention, holds and disposal under applicable policy.
- Domain reviewer
- Assess use, accessibility or tenure assertions only within evidenced competence.
Links to other meta-models Filled
references
- WM-BLT-001 - Required resolved building shell for an established top-level unit; nested units resolve through their parent. Provisional records can mark this binding unresolved and cannot pass established-instance validation. Building identity, shell lifecycle and structural geometry remain external.
- WM-PLC-010 - Optional generalized place/address context. Labels and addresses do not define spatial identity or transfer place lifecycle ownership.
- WM-OBJ-001 - Optional located physical items and bounding elements retain external identity, custody, ownership and lifecycle. Spatial context does not compose their master records.
- External tenure, occupancy and approval records - Unpinned adoption bindings hold legal units, parties, leases, title, scheme quotas and approval decisions outside this spatial root; resolve and version-pin before operational use.
child
- WM-BLT-002 - Candidate CONTAINS ledger edge represented by CHILD in the research schema. Independently identified subordinate units use acyclic effective-dated containment; no self-edge at instance level and no mandatory children.
aligned
- IFC 4.3.2.0 - Conceptual mapping to IfcSpace, boundaries, quantities and classifications. No IFC implementation or equivalence between legal and physical spaces is claimed.
- IndoorGML - Navigation-focused conceptual alignment only. Select and verify a version and transformation before implementing navigation exchange.
- SOSA/SSN 2017 and PROV-O 2013 - Use observation and provenance concepts for evidence references; no runtime ontology conformance is claimed.
neighbor
- WM-BLT-001 Building / Structure - Reference the building master. Interior extent geometry is local; shell and structural-element geometry remain building-owned. A nested unit can resolve its building transitively.
- WM-BLT-002 subordinate spatial units - Self-type CHILD link implements candidate CONTAINS with distinct instance identities, effective intervals and acyclic same-profile decomposition.
- WM-PLC-010 generalized place/address - Location and address bindings provide context; neither a label nor a postal address identifies the unit by itself.
- WM-OBJ-001 Physical Item - Items located in or bounding a unit retain their own masters. Location is neither composition nor ownership.
- Tenure, occupancy, approval and navigation models - Keep legal and operational assertion masters external. Local bindings and spatial interpretations do not grant rights or operate navigation.
parent
- WM-BLT-001
contains
- WM-BLT-002
What else AI and robots need to interact with it Incomplete
Identity and identifiers required Filled
- Authoritative master-system identifier with namespace
- Governed global identifier or IRI
- UUID or ULID assigned by the adopting Dimension
Direct properties required Missing, in the backlog
Not described yet. This gap is in the card backlog.
Recognition required Missing, in the backlog
Not described yet. This gap is in the card backlog.
Capabilities and actions required Filled
- Resolve spatial identity: Proposed local operation, not an implemented runtime. Assess source identifiers and aliases without automatically merging records.
- Register boundary evidence: Proposed local operation, not an implemented runtime. Attach a new boundary/geometry assertion after evidence and frame checks.
- Compare spatial quantities: Proposed local operation, not an implemented runtime. Compare only compatible quantity definitions and geometry revisions.
- Assess containment change: Proposed local operation, not an implemented runtime. Check the proposed time-scoped hierarchy before accepting a local edge.
- Record spatial succession: Proposed local operation, not an implemented runtime. Represent an evidenced correction, split, merger or retirement under the adopted identity policy.
- Produce authorized spatial view: Proposed local operation, not an implemented runtime. Select only permitted geometry and context for a named purpose.
Hazards and failure modes required Missing, in the backlog
Not described yet. This gap is in the card backlog.
Standards and interfaces required Derived, awaiting review
- PROV-O: The PROV Ontology
Context of use required Filled
- No jurisdiction is presumed. Interior-space scope is narrower than some external space models.
- Physical, legal, rentable and navigation extents can differ; adopting profiles must resolve intended use without universal equivalence.
Sources Filled
- IfcSpace - buildingSMART International
- IfcRelSpaceBoundary - buildingSMART International
- Qto_SpaceBaseQuantities - buildingSMART International
- Pset_SpaceCommon - buildingSMART International
- IndoorGML standard overview and version catalogue - Open Geospatial Consortium
- Semantic Sensor Network Ontology - World Wide Web Consortium
- PROV-O: The PROV Ontology - World Wide Web Consortium
- Date and Time on the Internet: Timestamps - Internet Engineering Task Force
Open questions
- Run the prepared source checker outside the sandbox and review source versions, exact scope and licensing, including the detailed IndoorGML release selected for adoption.
- Research applicable legal-space, property-measurement, disclosure and accessibility profiles without equating legal and physical boundaries or treating one jurisdiction as universal.
- Implement nested schemas and mappings with fixtures for renumbering, virtual boundaries, multi-storey units, cycles, overlapping profiles, incompatible areas, simultaneous occupants, succession and lawful disposal.
- Restore independent external review before promoting this reviewable draft toward canonical or publishable-draft status.
- No independent external review; local no-tools self-audit cannot substitute for it.
- Direct HTTP checks are unattempted under the owner-reported sandbox block; the coordinator checker must measure responses. Browser retrieval is not live HTTP or version certification.
- IndoorGML overview only; detailed 2.0 retrieval exceeded browser size limits and 1.1 retrieval failed. Navigation mapping remains unverified.
- Nested schemas, geometry algorithms, quantitative aggregation, migration mappings and adversarial instance fixtures are not implemented.
- Local legal tenure, planning, accessibility, safety, measurement licensing and disclosure bases require qualified adopting-profile research. LADM and property measurement standards suggested by legacy material were not admitted as verified sources.
Machine files
Provenance
world-models research · reviewable-draft
Built from: models/wm-blt-002-premises-spatial-unit/spec.yaml