NetBeans:如何提供脱机XML模式?

I would like to have the code completion and XML validation that comes from NetBeans having access to the schemas referenced in XML documents. Unfortunately I need to use NetBeans in an offline (completely disconnected from the Internet) location, meaning NetBeans fails in downloading the referenced .xsd files. However, I have all of the xsd files saved locally. I would like to have the code completion and XM