// Initial Population


define "Initial Population":
  ( "Inpatient Encounters During Measurement Period"
    union "Encounters with Patient Hospital Locations" ) InpatientEncounters
    with "Antidiabetic Drugs Administered or Ordered" ADD
      such that Coalesce(start of ADD.effective.toInterval(), ADD.authoredOn) during InpatientEncounters."hospitalizationWithObservation" ( )
    where ( InpatientEncounters.status = 'finished'
        or InpatientEncounters.status = 'in-progress'
        or InpatientEncounters.status = 'triaged'
        or InpatientEncounters.status = 'onleave'
        or InpatientEncounters.status = 'entered-in-error'
    )

define "SDE Race":
  (Patient.race()) R
    return Tuple {
      codes: R.ombCategory union R.detailed,
      display: R.text
    }

define "SDE Sex":
  case
    when Patient.sex() = '248153007' then "Male (finding)"
    when Patient.sex() = '248152002' then "Female (finding)"
    else null
  end

define "SDE Payer":
  [USQualityCore.Coverage: type in "Payer Type"] Payer
    return {
      code: Payer.type,
      period: Payer.period
    }

define "SDE Ethnicity":
  (Patient.ethnicity()) E
    return Tuple {
      codes: { E.ombCategory } union E.detailed,
      display: E.text
    }

/*
@description: Returns the Location resource specified by the given reference.
*/
define fluent function getLocation(reference Reference):
  singleton from (
    [Location] L where reference.references(L)
  )

/*
@description: Returns the medication code for the given MedicationRequest
*/
define fluent function getMedicationCode(request Choice<MedicationAdministration, MedicationRequest>):
  if request.medication is FHIR.CodeableConcept then
  	  request.medication as FHIR.CodeableConcept
  	else
  	  (singleton from ([Medication] M where request.medication.references(M))).code

/*
@description: Hospitalization with Observation returns the total interval from the start of any immediately prior emergency department visit through the observation visit to the discharge of the given encounter
*/
define fluent function hospitalizationWithObservation(TheEncounter Encounter ):
  TheEncounter Visit
  		let ObsVisit: Last([Encounter: "Observation Services"] LastObs
  				where LastObs.status = 'finished'
            and LastObs.period ends 1 hour or less on or before start of Visit.period
  				sort by end of period
  			),
  			VisitStart: Coalesce(start of ObsVisit.period, start of Visit.period),
  			EDVisit: Last([Encounter: "Emergency Department Visit"] LastED
  				where LastED.status = 'finished'
            and LastED.period ends 1 hour or less on or before VisitStart
  				sort by end of period
  			)
  		return Interval[Coalesce(start of EDVisit.period, VisitStart), end of Visit.period]

/*
@description: Converts the given [Period](https://hl7.org/fhir/datatypes.html#Period)
value to a CQL DateTime Interval
@comment: If the start value of the given period is unspecified, the starting
boundary of the resulting interval will be open (meaning the start of the interval
is unknown, as opposed to interpreted as the beginning of time).
*/
define function ToInterval(period FHIR.Period):
    if period is null then
        null
    else
        if period."start" is null then
            Interval(period."start".value, period."end".value]
        else
            Interval[period."start".value, period."end".value]

/*
@description: Converts the given FHIR [Coding](https://hl7.org/fhir/datatypes.html#Coding) value to a CQL Code.
*/
define function ToCode(coding FHIR.Coding):
    if coding is null then
        null
    else
        System.Code {
          code: coding.code.value,
          system: coding.system.value,
          version: coding.version.value,
          display: coding.display.value
        }

define function ToString(value string): value.value

/*
@description: Converts the given FHIR [CodeableConcept](https://hl7.org/fhir/datatypes.html#CodeableConcept) value to a CQL Concept.
*/
define function ToConcept(concept FHIR.CodeableConcept):
    if concept is null then
        null
    else
        System.Concept {
            codes: concept.coding C return ToCode(C),
            display: concept.text.value
        }

define function ToDateTime(value dateTime): value.value

define function ToDateTime(value instant): value.value

define function ToDate(value date): value.value

/*
@description: Converts the given FHIR [Quantity](https://hl7.org/fhir/datatypes.html#Quantity) 
value to a CQL Quantity
@comment: If the given quantity has a comparator specified, a runtime error is raised. If the given quantity
has a system other than UCUM (i.e. `http://unitsofmeasure.org`) or CQL calendar units (i.e. `http://hl7.org/fhirpath/CodeSystem/calendar-units`)
an error is raised. For UCUM to calendar units, the `ToCalendarUnit` function is used.
@seealso: ToCalendarUnit
*/
define function ToQuantity(quantity FHIR.Quantity):
    case
        when quantity is null then null
        when quantity.value is null then null
        when quantity.comparator is not null then
            Message(null, true, 'FHIRHelpers.ToQuantity.ComparatorQuantityNotSupported', 'Error', 'FHIR Quantity value has a comparator and cannot be converted to a System.Quantity value.')
        when quantity.system is null or quantity.system.value = 'http://unitsofmeasure.org'
              or quantity.system.value = 'http://hl7.org/fhirpath/CodeSystem/calendar-units' then
            System.Quantity { value: quantity.value.value, unit: ToCalendarUnit(Coalesce(quantity.code.value, quantity.unit.value, '1')) }
        else
            Message(null, true, 'FHIRHelpers.ToQuantity.InvalidFHIRQuantity', 'Error', 'Invalid FHIR Quantity code: ' & quantity.unit.value & ' (' & quantity.system.value & '|' & quantity.code.value & ')')
    end

/*
@description: Converts a UCUM definite duration unit to a CQL calendar duration
unit using conversions specified in the [quantities](https://cql.hl7.org/02-authorsguide.html#quantities) 
topic of the CQL specification.
@comment: Note that for durations above days (or weeks), the conversion is understood to be approximate
*/
define function ToCalendarUnit(unit System.String):
    case unit
        when 'ms' then 'millisecond'
        when 's' then 'second'
        when 'min' then 'minute'
        when 'h' then 'hour'
        when 'd' then 'day'
        when 'wk' then 'week'
        when 'mo' then 'month'
        when 'a' then 'year'
        else unit
    end

define function ToString(value EncounterStatus): value.value

define function ToString(value uri): value.value

/*
@description: Returns true if the given reference is to the given resource
@comment: Returns true if the `id` element of the given resource exactly equals the tail of the given reference.
NOTE: This function assumes resources from the same source server.
*/
define fluent function references(reference FHIR.Reference, resource FHIR.Resource):
  resource.id = Last(Split(reference.reference, '/'))

/*
@description: Normalizes a value that is a choice of timing-valued types to an equivalent interval
@comment: Normalizes a choice type of FHIR.dateTime, FHIR.Period, FHIR.Timing, FHIR.instance, FHIR.string, FHIR.Age, or FHIR.Range types
to an equivalent interval. This selection of choice types is a superset of the majority of choice types that are used as possible
representations for timing-valued elements in FHIR, allowing this function to be used across any resource.

The input can be provided as a dateTime, Period, Timing, instant, string, Age, or Range.
The intent of this function is to provide a clear and concise mechanism to treat single
elements that have multiple possible representations as intervals so that logic doesn't have to account
for the variability. More complex calculations (such as medication request period or dispense period
calculation) need specific guidance and consideration. That guidance may make use of this function, but
the focus of this function is on single element calculations where the semantics are unambiguous.
If the input is a dateTime, the result a DateTime Interval beginning and ending on that dateTime.
If the input is a Period, the result is a DateTime Interval.
If the input is a Timing, an error is raised indicating a single interval cannot be computed from a Timing.
If the input is an instant, the result is a DateTime Interval beginning and ending on that instant.
If the input is a string, an error is raised indicating a single interval cannot be computed from a string.
If the input is an Age, the result is a DateTime Interval beginning when the patient was the given Age,
and ending immediately prior to when the patient was the given Age plus one year.
If the input is a Range, the result is a DateTime Interval beginning when the patient was the Age given
by the low end of the Range, and ending immediately prior to when the patient was the Age given by the
high end of the Range plus one year.

NOTE: Due to the
complexity of determining a single interval from a Timing or String type, this function will throw a run-time exception if it is used
with a Timing or String.
*/
define fluent function toInterval(choice Choice<FHIR.dateTime, FHIR.Period, FHIR.Timing, FHIR.instant, FHIR.string, FHIR.Age, FHIR.Range>):
  case
    when choice is FHIR.dateTime then
      Interval[FHIRHelpers.ToDateTime(choice as FHIR.dateTime), FHIRHelpers.ToDateTime(choice as FHIR.dateTime)]
    when choice is FHIR.Period then
      FHIRHelpers.ToInterval(choice as FHIR.Period)
    when choice is FHIR.instant then
      Interval[FHIRHelpers.ToDateTime(choice as FHIR.instant), FHIRHelpers.ToDateTime(choice as FHIR.instant)]
    when choice is FHIR.Age then
      Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(choice as FHIR.Age),
        FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(choice as FHIR.Age) + 1 year)
    when choice is FHIR.Range then
      Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((choice as FHIR.Range).low),
        FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((choice as FHIR.Range).high) + 1 year)
    when choice is FHIR.Timing then
      Message(null as Interval<DateTime>, true, 'NOT_IMPLEMENTED', 'Error', 'Calculation of an interval from a Timing value is not supported')
    when choice is FHIR.string then
      Message(null as Interval<DateTime>, true, 'NOT_IMPLEMENTED', 'Error', 'Calculation of an interval from a String value is not supported')
    else
      null as Interval<DateTime>
  end

/*
@description: Returns the single extension (if present) on the given resource with the specified url.
@comment: This function uses singleton from to ensure that a run-time exception is thrown if there
is more than one extension on the given resource with the specified url.
*/
define fluent function ext(domainResource DomainResource, url String):
  singleton from domainResource.exts(url)

/*
@description: Returns any extensions defined on the given resource with the specified url
*/
define fluent function exts(domainResource DomainResource, url String):
  domainResource.extension E
    where E.url = url
    return E

/*
@description: Returns any extensions defined on the given element with the specified url.
*/
define fluent function exts(element Element, url String):
  element.extension E
    where E.url = url
    return E

/*
@description: Returns the single extension (if present) on the given element with the specified url.
@comment: This function uses singleton from to ensure that a run-time exception is thrown if there
is more than one extension on the given element with the specified url.
*/
define fluent function ext(element Element, url String):
  singleton from element.exts(url)

/*
@description: Returns an interval representing the normalized prevalence period of a given Condition resource.
@comment: Uses the toInterval and toAbatementInterval functions to determine the widest potential interval from
onset to abatement as specified in the given Condition.
*/
define fluent function prevalenceInterval(condition Condition):
if condition.clinicalStatus ~ "active"
  or condition.clinicalStatus ~ "recurrence"
  or condition.clinicalStatus ~ "relapse" then
  Interval[start of condition.onset.toInterval(), end of condition.abatementInterval()]
else
  (end of condition.abatementInterval()) abatementDate
    return 
	  if abatementDate is null then
        Interval[start of condition.onset.toInterval(), abatementDate)
      else
        Interval[start of condition.onset.toInterval(), abatementDate]

/*
@description: Returns an interval representing the normalized Abatement of a given Condition resource.
@comment: @comment: If the abatement element of the Condition is represented as a DateTime, the result
is an interval beginning and ending on that DateTime.
If the abatement is represented as a Quantity, the quantity is expected to be a calendar-duration and is interpreted as the age of the patient. The
result is an interval from the date the patient turned that age to immediately before one year later.
If the abatement is represented as a Quantity Interval, the quantities are expected to be calendar-durations and are interpreted as an age range during
which the abatement occurred. The result is an interval from the date the patient turned the starting age of the quantity interval, and ending immediately
before one year later than the date the patient turned the ending age of the quantity interval.

NOTE: Due to the complexity of determining an interval from a String, this function will throw
a run-time exception if used with a Condition instance that has a String as the abatement value.
*/
define fluent function abatementInterval(condition Condition):
  if condition.abatement is FHIR.dateTime then
    Interval[FHIRHelpers.ToDateTime(condition.abatement as FHIR.dateTime), FHIRHelpers.ToDateTime(condition.abatement as FHIR.dateTime)]
  else if condition.abatement is FHIR.Period then
    FHIRHelpers.ToInterval(condition.abatement as FHIR.Period)
  else if condition.abatement is FHIR.string then
    Message(null as Interval<DateTime>, true, 'NOT_IMPLEMENTED', 'Error', 'Calculation of an interval from a String value is not supported')
  else if condition.abatement is FHIR.Age then
    Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(condition.abatement as FHIR.Age),
      FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(condition.abatement as FHIR.Age) + 1 year)
  else if condition.abatement is FHIR.Range then
    Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((condition.abatement as FHIR.Range).low),
      FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((condition.abatement as FHIR.Range).high) + 1 year)
  else if condition.abatement is FHIR.boolean then
    Interval[end of condition.onset.toInterval(), condition.recordedDate)
  else 
    null

/*
@description: Returns the id of the given uri (i.e. everything after the last slash)
*/
define fluent function getId(uri String):
  Last(Split(uri, '/'))

define fluent function race(patient Patient):
  (patient.ext('http://hl7.org/fhir/us/core/StructureDefinition/us-core-race')) E
    return {
      ombCategory: (E.exts('ombCategory')) o return o.value as FHIR.Coding,
      detailed: (E.exts('detailed')) d return d.value as FHIR.Coding,
      text: E.ext('text').value as FHIR.string
    }

/*
@description: Returns the sex element as defined for the USCore patient profile
*/
define fluent function sex(patient Patient):
  patient.ext('http://hl7.org/fhir/us/core/StructureDefinition/us-core-sex').value as FHIR.code

define fluent function ethnicity(patient Patient):
  (patient.ext('http://hl7.org/fhir/us/core/StructureDefinition/us-core-ethnicity')) E
    return {
      ombCategory: E.ext('ombCategory').value as FHIR.Coding,
      detailed: (E.exts('detailed')) d return d.value as FHIR.Coding,
      text: E.ext('text').value as FHIR.string
    }

define "Inpatient Encounters During Measurement Period":
  [Encounter: "Encounter Inpatient"] InpatientEncounters
    where InpatientEncounters.period ends during day of "Measurement Period"
      and ( InpatientEncounters.class ~ USQualityCoreCommon."inpatient non-acute"
          or InpatientEncounters.class ~ USQualityCoreCommon."inpatient non-acute"
          or InpatientEncounters.class ~ USQualityCoreCommon."short stay"
          or InpatientEncounters.class ~ USQualityCoreCommon."inpatient acute"
          or InpatientEncounters.class ~ USQualityCoreCommon."inpatient encounter"
      )

define "Encounters with Patient Hospital Locations":
  "Inpatient Encounters During Measurement Period" InpatientEncounter
    where exists ( InpatientEncounter.location HospitalLocation
        where HospitalLocation.location.getLocation ( ).type in "Inpatient, Emergency, and Observation Locations"
          and HospitalLocation.period during day of InpatientEncounter.period
    )

define "MedicationRequests":
  [MedicationRequest]

define "MedicationAdministrations":
  [MedicationAdministration]

define "Antidiabetic Drugs Administered or Ordered":
  ( "MedicationRequests"
    union "MedicationAdministrations" ) MedReqOrAdmin
    where MedReqOrAdmin.getMedicationCode() in "Diabetes Medications"

// Initial Population


define "Initial Population":
  ( "Inpatient Encounters During Measurement Period"
    union "Encounters with Patient Hospital Locations" ) InpatientEncounters
    with "Antidiabetic Drugs Administered or Ordered" ADD
      such that Coalesce(start of ADD.effective.toInterval(), ADD.authoredOn) during InpatientEncounters."hospitalizationWithObservation" ( )
    where ( InpatientEncounters.status = 'finished'
        or InpatientEncounters.status = 'in-progress'
        or InpatientEncounters.status = 'triaged'
        or InpatientEncounters.status = 'onleave'
        or InpatientEncounters.status = 'entered-in-error'
    )

define "SDE Coverage":
  [Coverage] Coverages
    where exists ( "Initial Population" IP
        where Coverages.period starts before or on day of IP.period
          and end of Coverages.period on or after day of end of IP.period
    )
    return { Coverages.id, Coverages.meta, Coverages.status, Coverages.type, Coverages.policyHolder, Coverages.subscriber, Coverages.subscriberId, Coverages.beneficiary, Coverages.dependent, Coverages.relationship, Coverages.period, Coverages.payor, Coverages.class, Coverages.order, Coverages.network, Coverages.subrogation, Coverages.contract }

define "SDE Medication Request":
  "MedicationRequests" MedRequests
    where exists ( "Initial Population" InitialPopulation
        where MedRequests.authoredOn during InitialPopulation."hospitalizationWithObservation" ( )
    )
    return { MedRequests.id, MedRequests.meta, MedRequests.status, MedRequests.statusReason, MedRequests.intent, MedRequests.category, MedRequests.priority, MedRequests.doNotPerform, MedRequests.reported, MedRequests.medication, MedRequests.subject, MedRequests.encounter, MedRequests.authoredOn, MedRequests.requester, MedRequests.recorder, MedRequests.reasonCode, MedRequests.reasonReference, MedRequests.instantiatesCanonical, MedRequests.instantiatesUri, MedRequests.courseOfTherapyType, MedRequests.dosageInstruction }

define "SDE Encounter Locations":
  "Initial Population" IP
    where exists ( IP.location InitialPopulationLocation
        let types: ( InitialPopulationLocation.location ).getLocation ( ).type
        where exists ( types type
            where type in "Inpatient, Emergency, and Observation Locations"
        )
          and InitialPopulationLocation.period during IP.period
    )
    return { IP.id, IP.meta, IP.identifier, IP.status, IP.statusHistory, IP.class, IP.classHistory, IP.type, IP.serviceType, IP.priority, IP.subject, IP.period, IP.length, IP.reasonCode, IP.reasonReference, IP.diagnosis, IP.account, IP.hospitalization, IP.location, IP.partOf }

define "SDE Race":
  SDE."SDE Race"

define "SDE Medication Administration":
  "MedicationAdministrations" MedAdministrations
    where exists ( "Initial Population" InitialPopulation
        where MedAdministrations.effective.toInterval ( ) overlaps InitialPopulation."hospitalizationWithObservation" ( )
    )
    return { MedAdministrations.id, MedAdministrations.meta, MedAdministrations.instantiates, MedAdministrations.partOf, MedAdministrations.status, MedAdministrations.statusReason, MedAdministrations.category, MedAdministrations.medication, MedAdministrations.subject, MedAdministrations.context, MedAdministrations.supportingInformation, MedAdministrations.effective, MedAdministrations.performer, MedAdministrations.reasonCode, MedAdministrations.reasonReference, MedAdministrations.request, MedAdministrations.device, MedAdministrations.note, MedAdministrations.dosage }

define "SDE Sex":
  SDE."SDE Sex"

define "SDE Initial Population Encounters":
  "Initial Population" IP
    return { IP.id, IP.meta, IP.identifier, IP.status, IP.statusHistory, IP.class, IP.classHistory, IP.type, IP.serviceType, IP.priority, IP.subject, IP.period, IP.length, IP.reasonCode, IP.reasonReference, IP.diagnosis, IP.account, IP.hospitalization, IP.location, IP.partOf }

//Supplemental Data Elements


define "SDE Blood Glucose Observation":
  ( ["LaboratoryResultObservation": "Blood Glucose Laboratory and Point of Care Tests"] GlucoseTest
      where exists ( "Initial Population" InitialPopulation
          where start of GlucoseTest.effective.toInterval ( ) during day of InitialPopulation.period
            or GlucoseTest.issued during day of InitialPopulation.period
      )
      return { GlucoseTest.id, GlucoseTest.extension, GlucoseTest.text, GlucoseTest.referenceRange, GlucoseTest.component, GlucoseTest.basedOn, GlucoseTest.partOf, GlucoseTest.category, GlucoseTest.status, GlucoseTest.subject, GlucoseTest.focus, GlucoseTest.encounter, GlucoseTest.effective, GlucoseTest.issued, GlucoseTest.performer, GlucoseTest.value, GlucoseTest.dataAbsentReason, GlucoseTest.interpretation, GlucoseTest.note, GlucoseTest.bodySite, GlucoseTest.method, GlucoseTest.specimen, GlucoseTest.device, GlucoseTest.hasMember, GlucoseTest.derivedFrom }
  )

define "SDE Condition":
  ["ConditionProblemsHealthConcerns"] Diagnosis
    where exists ( "Initial Population" IP
        where Diagnosis.prevalenceInterval ( ) overlaps day of IP.period
    )
    return { Diagnosis.id, Diagnosis.meta, Diagnosis.clinicalStatus, Diagnosis.verificationStatus, Diagnosis.category, Diagnosis.severity, Diagnosis.code, Diagnosis.bodySite, Diagnosis.subject, Diagnosis.encounter.reference.getId(), Diagnosis.onset, Diagnosis.stage, Diagnosis.evidence, Diagnosis.note }

define "SDE Payer":
  SDE."SDE Payer"

define "SDE Ethnicity":
  SDE."SDE Ethnicity"

define "Get Locations from Initial Population":
  flatten ( "Initial Population" IP
      let locationElements: IP.location
      return locationElements LE
        let locationReference: LE.location
        return ( locationReference.getLocation ( ) )
  )

define "SDE Location":
  "Get Locations from Initial Population" Locations
    where exists "Initial Population"
      and Locations is not null
    return { Locations.id, Locations.meta, Locations.extension, Locations.status, Locations.operationalStatus, Locations.name, Locations.alias, Locations.description, Locations.mode, Locations.type, Locations.telecom, Locations.address, Locations.physicalType, Locations.position, Locations.managingOrganization, Locations.partOf, Locations.hoursOfOperation, Locations.availabilityExceptions, Locations.endpoint }

define "SDE Service Request":
  [ServiceRequest] ServiceRequests
    where exists ( "Initial Population" InitialPopulation
        where ServiceRequests.authoredOn during InitialPopulation.period
    )
    return { ServiceRequests.id, ServiceRequests.meta, ServiceRequests.instantiatesCanonical, ServiceRequests.instantiatesUri, ServiceRequests.basedOn, ServiceRequests.replaces, ServiceRequests.requisition, ServiceRequests.status, ServiceRequests.intent, ServiceRequests.category, ServiceRequests.priority, ServiceRequests.doNotPerform, ServiceRequests.code, ServiceRequests.orderDetail, ServiceRequests.quantity, ServiceRequests.subject, ServiceRequests.encounter, ServiceRequests.occurrence, ServiceRequests.asNeeded, ServiceRequests.authoredOn, ServiceRequests.requester, ServiceRequests.performerType, ServiceRequests.performer, ServiceRequests.locationCode, ServiceRequests.reasonCode, ServiceRequests.reasonReference, ServiceRequests.insurance, ServiceRequests.bodySite, ServiceRequests.note, ServiceRequests.patientInstruction }

define "SDE Minimal Patient":
  [Patient] MinPt
    where exists "Initial Population"
    return { MinPt.id, MinPt.meta, MinPt.extension, MinPt.identifier, MinPt.active, MinPt.name, MinPt.telecom, MinPt.gender, MinPt.birthDate, MinPt.deceased, MinPt.address, MinPt.maritalStatus, MinPt.multipleBirth, MinPt.photo, MinPt.contact, MinPt.communication, MinPt.generalPractitioner, MinPt.managingOrganization, MinPt.link }

define "SDE Medication":
  ( "MedicationRequests"
    union "MedicationAdministrations" ) MedReqOrAdmin
    let medication: GetMedication(MedReqOrAdmin.medication as Reference)
    where medication is not null
      and exists ( "Initial Population" IP
          where Coalesce(MedReqOrAdmin.effective.toInterval(), MedReqOrAdmin.authoredOn.toInterval()) overlaps IP."hospitalizationWithObservation" ( )
      )
    return { medication.id, medication.meta, medication.code, medication.status, medication.manufacturer, medication.form, medication.amount, medication.ingredient, medication.batch }

define "SDE Chief Complaint":
  "Initial Population" IP
    where exists ( IP.diagnosis InitialPopulationDiagnosis
        where InitialPopulationDiagnosis.use ~ FHIRCommon."CC"
    )
    return { IP.id, IP.meta, IP.identifier, IP.status, IP.statusHistory, IP.class, IP.classHistory, IP.type, IP.serviceType, IP.priority, IP.subject, IP.period, IP.length, IP.reasonCode, IP.reasonReference, IP.diagnosis, IP.account, IP.hospitalization, IP.location, IP.partOf }

define function "GetMedication"(reference Reference):
  singleton from ( [Medication] Medication
      where reference.references ( Medication )
  )