In some cases where the requesting subscription system is stateless or in events where you want all elements referenced irrespective of whether they have changed, a requesting system may use other filter expressions.
_include search parameter
The _include search parameter will return the resource rather than the references in Bundle
The mode is used to differentiate whether the resource returned is based on a “match” in the URL request or whether it is as part of “include”
The inclusion process can be iterative, if (and only if) the modifier :iterate is included
The following parameters are supported:
_include=Location:organization _include=HealthcareService:organization _include=HealthcareService:location _include=PractitionerRole:organization _include=PractitionerRole:location _include=PractitionerRole:service _include=PractitionerRole:practitioner _include=Provenance:target _include=Contract:subject _include:iterate=HealthcareService:organization _include:iterate=HealthcareService:location _include:iterate=PractitionerRole:organization _include:iterate=PractitionerRole:location _include:iterate=PractitionerRole:service _include:iterate=PractitionerRole:practitioner