```
public interface ITerminologyServices
```
The value set system has a collection of value sets that define code systems, and construct value sets from them Large external terminologies - LOINC, Snomed, etc - are too big, and trying to represent their definition as a native value set is too large. (e.g. LOINC + properties ~ 500MB). So we don't try. Instead. we assume that there's some external server that provides these services, using this interface The FHIR build tool uses http://fhir.healthintersections.com.au for these services

Author:

Grahame

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class ITerminologyServices.ValidationResult

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`checkVS(ValueSet.ConceptSetComponent vsi, String system, String code)`	Test the value set fragment (system \| codes \| filters).
`ValueSetExpander.ValueSetExpansionOutcome`	`expand(ValueSet vs)`
`ValueSet.ValueSetExpansionComponent`	`expandVS(ValueSet.ConceptSetComponent inc)`	Expand the value set fragment (system \| codes \| filters).
`ValueSet.ConceptDefinitionComponent`	`getCodeDefinition(String system, String code)`	given a system\|code, return a definition for it.
`boolean`	`supportsSystem(String system)`	return true if the service handles code or value set resolution on the system
`ITerminologyServices.ValidationResult`	`validateCode(String system, String code, String display)`	for this system\|code and display, validate the triple against the rules of the underlying code system
`boolean`	`verifiesSystem(String system)`

Method Detail

supportsSystem
```
boolean supportsSystem(String system)
```
return true if the service handles code or value set resolution on the system

getCodeDefinition

ValueSet.ConceptDefinitionComponent getCodeDefinition(String system,
                                                      String code)

given a system|code, return a definition for it. Nil means not valid

validateCode

ITerminologyServices.ValidationResult validateCode(String system,
                                                   String code,
                                                   String display)

for this system|code and display, validate the triple against the rules of the underlying code system

expandVS
```
ValueSet.ValueSetExpansionComponent expandVS(ValueSet.ConceptSetComponent inc)
                                      throws Exception
```
Expand the value set fragment (system | codes | filters). Note that this might fail if the expansion is very large. If the expansion fails, then the checkVS will be called instead

Throws:

Exception

expand

ValueSetExpander.ValueSetExpansionOutcome expand(ValueSet vs)

checkVS

boolean checkVS(ValueSet.ConceptSetComponent vsi,
                String system,
                String code)

Test the value set fragment (system | codes | filters).

verifiesSystem

boolean verifiesSystem(String system)

Interface ITerminologyServices

Nested Class Summary