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forgot to add the privacy layer 
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Federations interoperating (primarily) on a common legal basis, mutually acknowledging their operating rules. E.g. Federations joined in the 4-bridges forum.
2.3 Privacy Layer
The EU DPD and Safe Habor could be seen as a schema that allows interoperabiltiy between federations. Depending on the viewpoint the privacy layer could be seen as part of the legal layer.
3. Other Interoperability Concerns
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