What does that mean ?
ISO 15926 Part 3 describes the geometry that can be used to represent ISO 15926 objects. This enables drawings, P&ID's, 3D models etc to be graphically represented in an ISO 15926 format.
Is this available online ?
Yes there is a Reference Data Class of part 3 available at Posc-Caesar
Will ISO 15926 Part 3 change ?
ISO 15926 Part 3 is built upon ISO 10303:42 and 10303:104 and as such is very comprehensive. It is not anticipated that Part 3 will change.