# Simplified input data schema

This diagram is a minimal example of the data schema. It shows only the fields which are **mandatory** (in bold), strongly recommended, or which are required to link data together within or between files. Fields with a \* are a primary key.

RIDX is a **mandatory** field in any file that includes it. Without including your RIDX, records cannot be linked to your references and data loading will fail.&#x20;

Some fields will only take certain valid identifiers and there are additional fields which are not mandatory which are outlined in the [Field names and data types](field-names-and-data-types-minimal-data-submission) section.

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