hierarchyId

The ID of the hierarchy to query for the property ID. You can use the hierarchy's name instead of the hierarchy's ID. If the hierarchy has an external ID, you can specify externalId: followed by the external ID. For more information, see Using external IDs in the IoT SiteWise User Guide.

You use a hierarchy ID instead of a model ID because you can have several hierarchies using the same model and therefore the same propertyId. For example, you might have separately grouped assets that come from the same asset model. For more information, see Asset hierarchies in the IoT SiteWise User Guide.