Specify a series of local data stores from which data, along with the attributes supplied in the incoming token, will be used to fulfill the attribute contract.
Attribute sources are specific data store or directory locations containing information that might be needed for the attribute contract. They are used to retrieve supplemental attributes. You can use more than one attribute source when mapping values to the attribute contract. The order matters and affects the queries differently. For example, if you plan on using the result of a query as an input to a subsequent query, stack your attribute sources accordingly.
If you are editing a currently mapped token processor instance, you can add, remove, or reorder attribute sources, which might require additional configuration changes in subsequent tasks.