# Classify Data

The Classify Data tab is where you assign a sensitivity classification to every entity and attribute in your Mendix application. Completing this classification is required before a data policy can be considered fully configured.

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**Classification levels**

Each entity and attribute must be assigned one of the following levels:

Level 1 — Public No restrictions. Safe for unrestricted access or publication.

Level 2 — Internal For internal use only. Not intended for external audiences.

Level 3 — Confidential Sensitive data with restricted access. Requires explicit authorization.

Level 4 — Restricted Highest sensitivity. Strictly controlled access, often subject to regulatory requirements.

In addition to the classification level, attributes can be flagged as containing personal data. Use this to identify fields that fall under GDPR or similar data protection obligations.

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**Navigating the view**

You can navigate the classification view in two ways:

Left panel (domain model tree): Drill down from modules to entities using the expandable tree. This gives you a structural overview of your data model.

Right panel (list view): Navigate by selecting a module to see its entities, then select an entity to see its attributes. The list updates based on your selection.

Both navigation paths lead to the same classification interface — use whichever suits your workflow.

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**Classifying data manually**

To classify an individual item, use the Default Level dropdown in the list to assign the appropriate level. For attributes, you can additionally toggle the personal data flag.

The Status column shows whether classification for that item is complete.

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**Bulk classify**

To speed up classification, use the Bulk classify button to apply a classification level to multiple items at once.

How to use it:

1. Select the items you want to classify using the checkboxes.
2. Choose a Classification Level from the dropdown.
3. Optionally configure the two additional options described below.
4. Click Bulk classify.

Bulk classify options:

Auto-classify — When enabled, the selected modules or entities will automatically classify any new entities or attributes added in the future, using the level you have set. This is useful for keeping newly imported modules or extended entities compliant without manual follow-up.

Override Classification — When enabled, the bulk action will overwrite any classification levels that have already been set on the selected items. If this is left off, only unclassified items will be updated and existing classifications are preserved.

Note: Bulk classify operates at the level you are currently viewing. If you are viewing the module list, it applies to modules. If you are viewing entities or attributes, it applies to those respectively.


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