Reading data

This section describes methods for reading data from the Oracle HDR FHIR Repository.

• Diff operation
  Use the $diff operation to generate a differential between two versions of a resource, or between two different resources of the same type.
• Diff at Instance Level
  When you invoke the $diff operation at the instance level (meaning it is invoked on a specific resource ID), it compares two versions of the given resource.
• Diff at Type Level
  When the $diff operation is invoked at the type level (meaning it is invoked on a specific resource type), it will compare two different resources of the same type.
• $everything operation
  The Oracle HDR-FHIR jpa server supports the Patient/$everything operation and accepts all the IN parameters defined in the documentation. Additionally, Oracle HDR allows you to provide an _id parameter, in order to filter the set of patients you wish to get everything for.