The command chains (hereinafter referred to as "chains" ) that can be executed by a specific workflow are grouped in a command chain catalog (hereinafter referred to as "catalog"). The catalog associated with the workflow has the same ID as the workflow itself. You can add new chains to a catalog. A chain does not need to be used by a transition. Deleting unused chains is not necessary. The contents of a chain can be modified, that is, you can add or remove commands. When adjusting a catalog, you must specify the new and the changed chains. You can omit all of the unchanged chains.