FHIRPath Function: subsetOf

Returns true if all items in the input collection are members of the collection passed as the other argument. Membership is determined using the equals (=) operation.

Conceptually, this function is evaluated by testing each item in the input collection for membership in the other collection, with a default of true. This means that if the input collection is empty ({ }), the result is true, otherwise if the other collection is empty ({ }), the result is false.

The following example returns true if the tags defined in any contained resource are a subset of the tags defined in the MedicationRequest resource:

MedicationRequest.contained.meta.tag.subsetOf(MedicationRequest.meta.tag)

Summary

• Category: Existence
• Section: 5.1.8
• Return Type: Boolean
• Empty Input Result: true
• Errors on Multiple Input: false

Description

Returns true if all items in the input collection are members of the collection passed as the other argument. Membership is determined using the equals (=) operation.

Arguments

• other: collection - Collection to check membership against

Type Mapping

• Any-Boolean

Example

MedicationRequest.contained.meta.tag.subsetOf(MedicationRequest.meta.tag)