ISO 10303-22

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ISO 10303-22 is a part of the implementation methods of STEP with the official title Standard data access interface or simply SDAI.

SDAI defines an abstract Application Programming Interface (API) to work on application data according to a given data models defined in EXPRESS. SDAI itself is defined independent of a particular programming language. Language bindings exist for

Part 23 - C++ language binding of the standard data access interface
Part 24 - C language binding of the standard data access interface
Part 27 - Java_programming_language binding to the standard data access interface with Internet/Intranet extensions

The development of language bindings for FORTRAN and the interface definition language (IDL) of CORBA were canceled.

Part 35 of STEP Abstract test methods for SDAI implementations provides a formal way how to prove the conformance of an implementation with SDAI.

The main components of SDAI are:

SDAI dictionary schema, a meta level EXPRESS schema to describe EXPRESS schemas
Managing objects
- SDAI session to control the whole SDAI environment for a single user/thread including optional transaction control
- SDAI repository the physical (typically) container to store SDAI models and Schema instances, e.g. a database
- SDAI model a subdivision of an SDAI repository, containing entity instance according to a particular EXPRESS schema
- Schema instance a logical grouping of one or several SDAI models, making up a valid population according to a particular EXPRESS schema
Operations
- to deal with the managing objects
- to create, delete and modify application data (entity instance, attribute values, aggregates and their members)
- to validate application data according to all the constraints and rules specified in EXPRESS