> For the complete documentation index, see [llms.txt](https://docs.eximee.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.eximee.com/documentation/documentation-en/budowanie-aplikacji/proces-biznesowy/model-danych-w-procesie.md).

# Data model in the process

To be able to use **the data model** in the process, you need to perform the following steps:

1. **Create a data model.**
2. **Link the data model keys bidirectionally to the request**\
   (details described in the section [*Data model on the interface*](/documentation/documentation-en/budowanie-aplikacji/interfejs-uzytkownika/formularze/praca-z-komponentami-bazowymi/model-danych-na-interfejsie.md)).
3. **Run the application with the assigned data model.**

After completing the above steps, the data model is available in the process.

***

### Where can the data model be used?

The data model can be used in:

* **script tasks**,
* **user tasks**,
* **subprocesses**.

***

### Limitations — where do model keys not work?

Data model keys **do not work** in:

* BPMN gateways,
* script **BPMN Script Tasks**.([BPMS script task (scriptTask)](/documentation/documentation-en/budowanie-aplikacji/proces-biznesowy/zadania-automatyczne/zadanie-skryptowe-bpms-scripttask.md))

If we want to use model data in these BPMN elements, we need to **map it to process variables**.\
More information in the section [*Passing data to the process*](/documentation/documentation-en/budowanie-aplikacji/proces-biznesowy/przekazywanie-danych-do-procesu.md).

***

### modelInstanceId – access to the model instance

A process that uses the data model automatically receives the variable:

**`modelInstanceId`**

This is the identifier of the data model instance in which the model values are stored.\
All operations on the data model during the process use this variable.

***

### Script tasks

A detailed description of using the data model in script tasks can be found here:\
[script task API](/documentation/documentation-en/budowanie-aplikacji/logika-biznesowa/scriptcode/zadanie-skryptowe-scripttask/api-zadan-skryptowych.md#model-danych) and [Data model API](/documentation/documentation-en/budowanie-aplikacji/model-danych/wykorzystanie-modelu-danych/api-modelu-danych.md).

***

### User Tasks

In User Tasks, using the data model consists of using model keys in the same way as in the section [Data model on the interface](/documentation/documentation-en/budowanie-aplikacji/interfejs-uzytkownika/formularze/praca-z-komponentami-bazowymi/model-danych-na-interfejsie.md).

***

### Subprocesses

To use the data model in a subprocess:

1. Pass the variable **`modelInstanceId`**.
2. Variable name **must be identical** as in the calling process.


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