{
  "model": {
    "TITLE": {
      "value": "User Authentication Sequence"
    },
    "AUTHOR": {
      "value": "Steve White",
      "readOnly": "true"
    },
    "MODELTYPE": {
      "value": "SEQUENCE_DIAGRAM",
      "inputType": "select",
      "refData": "MODELTYPE"
    },
    "DESCRIPTION": {
      "value": "Example sequence diagram showing user authentication flow with login, validation, and response",
      "inputType": "textarea"
    },
    "LAYOUT": {
      "inputType": "select",
      "value": "Sequence",
      "refData": "LAYOUTTYPE"
    }
  },
  "systems": [
    {
      "ID": "USER",
      "TEXT": "User",
      "TYPE": "SEQ_ACTOR"
    },
    {
      "ID": "LOGIN_UI",
      "TEXT": "Login UI",
      "TYPE": "SEQ_BOUNDARY"
    },
    {
      "ID": "AUTH_CTRL",
      "TEXT": "Auth Controller",
      "TYPE": "SEQ_CONTROL"
    },
    {
      "ID": "USER_SVC",
      "TEXT": "User Service",
      "TYPE": "SEQ_ENTITY"
    },
    {
      "ID": "USER_DB",
      "TEXT": "User Database",
      "TYPE": "SEQ_DATABASE"
    }
  ],
  "interactions": [
    {
      "ID": "MSG1",
      "FROMID": "USER",
      "TOID": "LOGIN_UI",
      "TEXT": "enterCredentials(username, password)",
      "TYPE": "SEQ_SYNC_CALL"
    },
    {
      "ID": "MSG2",
      "FROMID": "LOGIN_UI",
      "TOID": "AUTH_CTRL",
      "TEXT": "authenticate(credentials)",
      "TYPE": "SEQ_SYNC_CALL"
    },
    {
      "ID": "MSG3",
      "FROMID": "AUTH_CTRL",
      "TOID": "USER_SVC",
      "TEXT": "validateUser(username, password)",
      "TYPE": "SEQ_SYNC_CALL"
    },
    {
      "ID": "MSG4",
      "FROMID": "USER_SVC",
      "TOID": "USER_DB",
      "TEXT": "findUser(username)",
      "TYPE": "SEQ_SYNC_CALL"
    },
    {
      "ID": "MSG5",
      "FROMID": "USER_DB",
      "TOID": "USER_SVC",
      "TEXT": "userRecord",
      "TYPE": "SEQ_RETURN"
    },
    {
      "ID": "MSG6",
      "FROMID": "USER_SVC",
      "TOID": "AUTH_CTRL",
      "TEXT": "validationResult",
      "TYPE": "SEQ_RETURN"
    },
    {
      "ID": "MSG7",
      "FROMID": "AUTH_CTRL",
      "TOID": "LOGIN_UI",
      "TEXT": "authToken",
      "TYPE": "SEQ_RETURN"
    },
    {
      "ID": "MSG8",
      "FROMID": "LOGIN_UI",
      "TOID": "USER",
      "TEXT": "loginSuccess",
      "TYPE": "SEQ_RETURN"
    }
  ]
}