BASE <http://a.example/>

PREFIX : <http://hl7.org/ns/fhir>
PREFIX fhir: <http://hl7.org/ns/fhir#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

<#Observation> {
  fhir:code .? ;
  fhir:component {
    fhir:code . ;
    fhir:value .
  }*
}

# -- super-classes --
ABSTRACT <#Vital> @<#Observation> AND .
ABSTRACT <#PostureVital> @<#Vital> AND EXTENDS @<#Posture> {}
ABSTRACT <#ReclinedVital> @<#PostureVital> AND EXTENDS @<#Reclined> {}

# -- BP --
<#BP> EXTENDS @<#Vital> {} AND {
  fhir:component { fhir:code ["systolic"] } ;
  fhir:component { fhir:code ["diastolic"] }
}

<#PostureBP> EXTENDS @<#BP> EXTENDS @<#PostureVital> { }
<#ReclinedBP> EXTENDS @<#BP> EXTENDS @<#ReclinedVital> { }

# -- Pulse --
<#Pulse> EXTENDS @<#Vital> {} AND {
    fhir:code ["pulse"]
}
<#PosturePulse> EXTENDS @<#Pulse> EXTENDS @<#PostureVital> { }
<#ReclinedPulse> EXTENDS @<#Pulse> EXTENDS @<#ReclinedVital> { }

# -- postures --
<#Posture> {
  fhir:component {
    fhir:code ["posture"]
  }
}

<#Reclined> @<#Posture> AND {
  fhir:component {
    fhir:code ["posture"] ;
    fhir:value ["reclined"]
  }
}