Overview - EN ISO 21597-2:2020 (Information container, Link types)
EN ISO 21597-2:2020 (ISO 21597-2:2020) is the part‑2 specification of the Information Container for Linked Document Delivery series. It extends the generic container model defined in ISO 21597‑1 by defining specialized link types and semantic annotations that describe relationships between documents and entities inside a container. The standard targets the construction and building information modelling (BIM) domain but is applicable wherever multiple interrelated documents are exchanged as a single information payload.
Key facts:
- Published as an EN ISO standard (approved November 2020).
- Prepared by ISO/TC 59 in collaboration with CEN/TC 442 (BIM).
- Uses RDF/RDFS/OWL constructs for annotations and includes guidance for validation (SHACL).
Key topics and technical requirements
- Link type taxonomy: Defines categories and named link types that specialize the generic links from ISO 21597‑1 (examples include Identity, Conflict, Alternative, Specialization, Aggregation, Membership, Replacement, Elaboration, Control).
- Use of semantic web constructs: Recommends RDF, RDFS and OWL2 for expressing annotations and link semantics while remaining intentionally annotation‑focused (machine reasoning is out of scope).
- Container structure: Relates link annotations to the container model in Part 1 so links can reference whole documents and sub‑entities within documents.
- Conformance and validation: Includes conformance requirements and guidance on validating linksets (Annex B shows SHACL validation approaches).
- Extended Linkset ontology: Normative extension provided (Annex C) to enable consistent representations of the defined link types.
- Human interpretability: Emphasizes human‑readable semantic relationships to reduce ambiguity in linked document delivery.
- Patent notice: the document notes potential patent claims related to implementation.
Practical applications and who uses it
- Use cases:
- Exchange of multi‑document BIM packages where relationships (replaces, supersedes, aggregates) must be explicit.
- Document management in construction contracts, version control, and compliance workflows.
- Packaging technical documentation sets that require human‑interpretable linkage metadata.
- Primary users:
- BIM coordinators, information managers, and architects/engineers managing document handovers.
- Software vendors building container exporters/importers, document management and workflow systems.
- Standards/IT teams implementing interoperable exchange formats for construction projects.
Related standards
- ISO 21597‑1:2020 - Container format and generic link model (required companion document).
- W3C specs referenced: RDF 1.1, OWL 2, and SHACL (for validation guidance).
EN ISO 21597‑2:2020 provides a practical, standards‑based way to add clear, semantic link types to information containers - improving clarity, interoperability and traceability in linked document delivery for BIM and construction information exchange.