title: What does "Unauthorized zone" mean when browsing xsd files with Visual Studio 2010?
body: <p>When I open up an xsd file that includes other xsd files, all of the included files are added to a section called &quot;Unauthorized zone&quot;. Visual Studio highlights the <code>xs:include</code> element and gives the following error when trying to resolve the schemaLocation attribute:</p>
  <blockquote>
  <p>Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.</p>
  </blockquote>
  <p>I've read the following <a href="https://docs.microsoft.com/en-us/archive/blogs/xmlteam/understanding-xml-schema-sets-in-the-xsd-designer" rel="nofollow noreferrer">blog post</a>, but I'm not familiar enough with xsd yet to fully understand it.</p>
  <p>Can anyone explain why this is happening or point me to a good resource that can help?</p>
  <p>[Edit]
  All of the xsd files that are to be included are in the Visual Studio project.</p>