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In popup menu for a schema file in Projects window, a new item has appeared: Generate Sample XML. Clicking it brings up a dialog, so, according to general agreements, it should have an ellipsis at the end: "Generate Sample XML..."
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss