Scheme
Refers to a set of properties or options that are common between one or multiple types of objects, and users can modify these properties to propagate the changes to all or a selected set of objects in the drawing.

Scheme Builder
A tool that allows for easy creation of a predefined arrangement (a Scheme Design) of such scheme in Catalogue Creator to modify data driven symbols.​

Property
A specific entry or instance of a feature that is associated with custom labels or custom rules. ​

Scheme Design
Defines an arrangement of the tabs, sections, and properties, along with custom rules for each properties if any. The domains and default value of each properties is derived from the data.​ A Scheme Design can be activated or deactivated to allow it to be shown or hidden from the Scheme Explorer after it is published to the catalogue. 

Library
The section to the right that shows all the available features and products available in the catalogue for use in the Scheme Builder.​ 

Key
A unique code that identifies the scheme design itself, or any specific item (i.e. tabs, sections, properties) in the scheme design.​