description:
A group of entries within a composition, topic or category that have a logical association
with one another.
The representation of a single observation or action might itself be multi-part. The
data might need to be represented as a nested set of values, as a table, list, or
as a time series. The Cluster class permits such aggregation within an entry for such
compound data.
Examples include "Haematology investigations" which might include two or more distinct
batteries.
A cluster may contain batteries and/or individual entries
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