# Data strucuture

A Source target sankey diagram requires a recursive data model due to its intricate representation of data flows between different entities. The basic requirement is a source, target and a value.  

<figure><img src="/files/8O12VRVKCfEfvRdxPFrN" alt="" width="375"><figcaption></figcaption></figure>

Circular loops and external flows are currently unsupported in the source-target Sankey diagram. If your system involves a circular loop, please refer to the circular Sankey diagram for proper representation.&#x20;


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