Amazon Eventbridge Scheduler Placement Constraint Structure

{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/amazon-eventbridge-scheduler/refs/heads/main/json-structure/amazon-eventbridge-scheduler-placement-constraint-structure.json",
  "name": "PlacementConstraint",
  "description": "An object representing a constraint on task placement.",
  "type": "object",
  "properties": {
    "expression": {
      "allOf": [
        {
          "$ref": "#/components/schemas/PlacementConstraintExpression"
        },
        {
          "description": "A cluster query language expression to apply to the constraint. You cannot specify an expression if the constraint type is <code>distinctInstance</code>. For more information, see <a href=\"https://docs.aws.amazon.com/latest/developerguide/cluster-query-language.html\">Cluster query language</a> in the <i>Amazon ECS Developer Guide</i>."
        }
      ]
    },
    "type": {
      "allOf": [
        {
          "$ref": "#/components/schemas/PlacementConstraintType"
        },
        {
          "description": "The type of constraint. Use <code>distinctInstance</code> to ensure that each task in a particular group is running on a different container instance. Use <code>memberOf</code> to restrict the selection to a group of valid candidates."
        }
      ]
    }
  }
}