ISO/TS 10303-1450:2011-10 specifies the application module for
System structure.

The following is within the scope of
ISO/TS 10303-1450:2011-10:

• This part of ISO 10303 specifies an application module for the representation
  of all system structure specification information consistent with the needs of
  systems engineering; that is, the description of how a system decomposes
  into its parts and how the parts assemble to make the whole.