The FHIRPath Expression Editor is a tool designed for non-technical users working with electronic medical forms based on the FHIR Questionnaire resource. It offers a low-code environment for creating, editing, and testing FHIRPath expressions that support dynamic behavior, calculations, data population, and named expressions within forms.
Key Use Cases:
Enable or disable fields dynamically
Calculate values (e.g., scores, age, BMI)
Pre-fill form fields using existing data
Define and reuse named expressions
How to Use the FHIRPath Editor
1. Create an Expression
After creating the form and adding a set of fields:
Navigate to the Rules section of the field where you want to apply logic.
Select one of the expressions: Enable-when, Calculated, or Population.
Click
Visual Modeto open the FHIRPath Expression Editor.Set any variables (named expressions) you want to use in the expression.
Write your final FHIRPath expression using the editor interface.
2. Test and Debug an Expression
After writing your expression:
Fill out the form as a user would.
Open the Debug Console to test and debug how your expression behaves with actual data.
Close the FHIRPath Editor panel when you're finished. Any expressions you've written are saved automatically into the Questionnaire resource.
Validation and Error Handling
Automatic Validation: FHIRPath expressions are validated in real time.
Error Highlighting: If there are issues with syntax or logic, errors will be highlighted directly in the editor for easy correction.
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