json_schema: {
      "id": "http://schemas.triniti.io/json-schema/gdbots/ncr/mixin/edge/1-0-0.json#",
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "from_ref": {
              "type": "string",
              "pattern": "^[\\w\\/\\.:-]+$",
              "pbj": {
                  "type": "identifier",
                  "rule": "single"
              }
          },
          "to_ref": {
              "type": "string",
              "pattern": "^[\\w\\/\\.:-]+$",
              "pbj": {
                  "type": "identifier",
                  "rule": "single"
              }
          },
          "multiplicity": {
              "type": "string",
              "default": "multi",
              "enum": [
                  "unknown",
                  "multi",
                  "simple",
                  "many2one",
                  "one2many",
                  "one2one"
              ],
              "pbj": {
                  "type": "string-enum",
                  "rule": "single",
                  "overridable": true
              }
          },
          "created_at": {
              "type": "string",
              "pattern": "^[1-9]{1}[0-9]{12,15}$",
              "pbj": {
                  "type": "microtime",
                  "rule": "single"
              }
          }
      },
      "required": [
          "from_ref",
          "to_ref"
      ],
      "additionalProperties": true
  }