In the Fusion 360 API Object Model pdf, what are the letters in brackets ?

[Anonymous]

In the Fusion 360 API Object Model pdf, quiet a few "Standard Object" boxes have one or two letters in parenthesis or square brackets. What are the letters indicating ? Please see attached screenshot for examples, the letters in brackets are highlighted.

[BrianEkins]

The layout of the chart represents the ownership hierarchy of the objects. It's also how you need to traverse the objects to get to a specific type. For example, to get to a feature you first have to access Fusion through the Application object. From the Application you can access a specific document. In it you can get the Design product and then any components within it. Finally, from a component you can access the features.

A lot of object charts show how objects are derived from one another, not the ownership. The letters are used to indicate the base classes (in bold and brackets) and their derived classes (in italics and parentheses).

[JeromeBriot · Accepted solution]

Hello,

The objects (x) are derived from the objects [x]

It's explained at 1:25 in this video:  Introduction to the Fusion Object Model

I highly recommend watching the other videos at Fusion 360 Hackathon

[Anonymous]

So, in the Fusion 360 API Object Model pdf, for example, if an object box has the letter [A] in square brackets and bold, and, other object boxes have the same letter but, (A), in parenthesis and italicized, that means that all the objects having the "(A)" are derived from the object having the "[A]", right ?

[BrianEkins · Accepted solution]

That's correct.

[Anonymous]

Jérôme, thanks for the explanation and the links, these were very useful to clarify the concepts.