simplePath
A restricted path expression used in code path positions within retrieve expressions. Supports simple member access, dot-qualified access, and indexed access with a string or number literal.
Examples
Simple property path
[Condition: code in "Diabetes Mellitus"]
Nested path
[Observation: component.code in "BP Codes"]
Indexed path
[Condition: coding[0] in "Diabetes Codes"]
EBNF
simplePath : referentialIdentifier | simplePath '.' referentialIdentifier | simplePath '[' simpleLiteral ']' ;