Confirmation

Group unwrapping

Group Unwrapping helps you write shorter queries. When you need multiple nested values, Group unwrapping helps you get multiple values from the same sub node.The following query produces a flattened list of the fields name.given and name.family.

  from Patient 
  select name { given, family }

Other than the field names, it would produce the same result as writing

  from Patient
  select
    name.given,
    name.family

Complex dereferencing

Note that although derefercing in it's basic form uses dot notation, you can actually use any FhirPath expression. The following will work:

  from Patient 
  select
    name.where(use = 'official') { given, family }

But in many more complex cases, it might be easier to read when using a for expression. The following produces the same output:

  from Patient
  select 
     for name where use = 'official' 
     select { given, family }

See the documentation on for expressions for more information.