A bundle allows multiple {@link ExternalId external identifiers} to be grouped together when they all refer to the same conceptual object. For example, a Reuters RIC and Bloomberg Ticker might bothrefer to the same equity.
The bundle holds a set of external identifiers, not a map from scheme to value. This permits multiple values within the same scheme to refer to the same conceptual object. For example, a renamed ticker could be grouped as both the old and new value. In general however, each external identifier in a bundle will be in a different scheme.
This class is immutable and thread-safe.
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