Based on the provided extracts, the Ory API's

postCheckPermission

and

postCheckPermissionOrError

methods accept a single

subject_id

or a

subject_set

in the request body. The

subject_set

is an object that includes a

namespace

,

object

, and

relation

. There is no mention of the ability to include multiple subjects within a single

subject_set

in these methods. Here is an example of the request body structure:

json {   "namespace": "Namespace to query",   "object": "Object to query",   "relation": "Relation to query",   "subject_id": "SubjectID to query",   "subject_set": {     "namespace": "Namespace of the Subject Set",     "object": "Object of the Subject Set",     "relation": "Relation of the Subject Set"   } }

In this structure,

subject_id

and

subject_set

are alternatives - you can provide either a

subject_id

or a

subject_set

, but not both. And within the

subject_set

, there is no provision for multiple subjects. For more details, you can refer to the [Ory API Reference](https://www.ory.sh/docs/reference/api).

Based on the provided extracts, a

SubjectSet

in Ory Keto refers to all subjects who have the same

relation

on an

object

. However, it does not explicitly mention the ability to include multiple subjects within a single

SubjectSet

. Here is the structure of a `SubjectSet`:

json {   "namespace": "Namespace of the object and relation referenced in this subject set",   "object": "The object related by this subject set",   "relation": "The relation between the object and the subjects" }

In this structure, there is no provision for multiple subjects. The

SubjectSet

is designed to refer to a set of subjects that share the same relation to an object, but it does not specify that multiple individual subjects can be included in a single

SubjectSet

. For more details, you can refer to the [Ory Keto Protocol Documentation](https://www.ory.sh/docs/keto/reference/proto-api#subjectset).