aliasedQuerySource
A query source paired with an alias. The alias introduces a local name that can be used to reference elements of the source within the query's clauses, such as where and return.
Examples
Retrieve with alias
[Condition: "Diabetes Mellitus"] C
Named expression with alias
"Active Encounters" E
Used in a full query
from [Encounter] E where E.period during "Measurement Period" return E
EBNF
aliasedQuerySource : querySource alias ;