In Visual Studio, where is schema usage stored?

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XML

Visual-Studio

When editing an XML file in Visual Studio 2008 there is a Schema property exposed. This contains a list of all schemas in use by the document. If the namespace of the xml document is http://schemas.microsoft.com/developer/msbuild/2003[^] then a set of schemas are automatically inserted into this schemna property.

If I don't want to use these schemas, I access the schema property, which opens the Schema Editor, and in there I can choose to not use certain schemas. If the solution is closed and reopened, these schemas remain not used.

But when someone opens the same solution on a different machine the schemas are in use again! So where is this choice stored, if not in the *.csproj file?