| Object passed into a service contributor method that allows the method provide contributed values
to the service's configuration.
A service can collect contributions in three different ways:
- As an un-ordered collection of values
- As an ordered list of values (where each value has a unique id, pre-requisited and
post-requisites)
- As a map of keys and values
This implementation is used for un-ordered configuration data.
The service defines the type of contribution, in terms of a base class or service
interface. Contributions must be compatible with the type.
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