Authorization based on OASIS ABAC/RBAC/XACML approach


Is anybody aware of any open source .NET authorization solution based on OASIS ABAC/RBAC/XACML approach?

I have found some visible amount of Java based solutions but it seems .NET is completely out of it (lack of interest, not in trend?).

What does .NET community use then to implement Attribute or Role based authorization?

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