Visual Studio reports fake schema validation errors. How to clean SharePoint schema cache?

Question

I have recently generated a couple of ListDefinitions using both SPSource and VSeWSS SharePoint Solution Generator. In both cases, surpisingly, Visual Studio reports fake schema validation errors in schema.xml like

The 'Description' attribute is not declared" for List xmlns="http://schemas.microsoft.com/sharepoint/" BaseType="0" DefaultItemOpen="0" Description=""... >...

followed by errors like

Could not find schema information for the element 'http://schemas.microsoft.com/sharepoint/:GetVar'.

Can anyone help me fix that?

Answer 1

Silly me. They weren't fake. Some of the exported attributes really break the schema and only get generated after the solution being deployed and activated.