ISO 16757-4:2025

Overview

ISO 16757-4:2025 - Data structures for electronic product catalogues for building services - Part 4: Data dictionary structures for product catalogues - specifies requirements for data dictionaries that give semantic meaning and data modelling support to product catalogues used in building services. The standard defines an overall model of dictionary elements (subject kinds, relationship types and property kinds), describes how the model maps to the ISO 12006-3 data dictionary model via a dictionary meta level, and provides rules and recommendations to fill gaps identified in related standards used by ISO 16757-5. This part does not mandate catalogue organization or exchange formats.

Key Topics

• Subject kinds: clear classification of dictionary entries such as product subjects (catalogue products), catalogue subjects (catalogue metadata), and blocks (collections of properties representing complex features, ports and in/outlets).
• Relationship types: standardized relationships to express semantics, e.g. isSubtypeOf, hasPart, hasBlock, isDependentOn, isSubkindOf.
• Property kinds: differentiation between static properties (descriptive values supplied in catalogues), dynamic properties (behavioural characteristics used in simulation/engineering), and external properties (environmental or system conditions that influence dynamic properties).
• Mapping to ISO 12006-3: introduction of a dictionary meta level to represent the overall model within the ISO 12006-3 framework, ensuring compatibility with established construction information models.
• Rules & recommendations: guidance for required dictionary elements, cardinality for relationships, position-in-space considerations, predefined calculation functions for dynamic properties, and handling controlled value lists.

Applications and Who Uses It

ISO 16757-4:2025 is intended for stakeholders involved in digital building services product data and BIM workflows:

• Manufacturers and catalogue publishers creating semantically rich product catalogues
• BIM and MEP engineers who need reliable product semantics for design, analysis and simulation
• Software developers and integrators building catalogue management, specification, or simulation tools
• Facility managers and system operators relying on interoperable product data across lifecycle tools

Practical uses include consistent modelling of product behaviour (dynamic properties), defining connection points (ports/inlets), integrating product semantics into BIM workflows, and improving interoperability between manufacturer catalogues and engineering tools.

Related Standards

• ISO 16757 series (Parts 1, 2, 5) - product catalogue structure, geometry and catalogue organization
• ISO 12006-3 - framework for object-oriented information (data dictionary mapping)
• ISO 23386 / ISO 23387 - methodologies for describing, authoring and maintaining properties and dictionaries in BIM contexts

Keywords: ISO 16757-4:2025, data dictionary, product catalogues, building services, BIM, ISO 12006-3, dynamic properties, ports, semantic modelling.