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I have opened a 3rd party XSD file in Visual Studio 2010 that imports namespaces from other schema files from the same 3rd party.

In the XML editor view of the schema file, the xs:import element is underlined with the following error: Request for the permission of type 'System.Security.Permissions.FileIOPermission', mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

I read the following blog post: http://blogs.msdn.com/b/xmlteam/archive/2009/06/04/understanding-xml-schema-sets-in-the-xsd-designer.aspx which states that it's a security zone violation and Visual Studio places the schemas in the "Unauthorized zone" in the XML Schema Explorer.

My question is - how do I change my security settings to allow these schemas to be referenced, or is there something I can do to make the schemas and namespaces associated with them "trusted"?

A: 

Possibly answered by this post.

Colin Desmond