CAML content definitions have no debugging support through Visual Studio. This can make it frustrating to develop custom content types, lists, and other provisioning components. You can, however, enable verbose logging through SharePoint Central Administration. From the Operations tab, under Logging and Reporting, select Diagnostic Logging. You can then set Event Throttling to report on all categories, to report on events of information criticality and above, and to report verbosely. For a personal development server, you can use just one log file for a period of ten minutes. The default path for the logs is C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\LOGS. You may want to import the log into Microsoft Office Excel 2007 or just use Visual Studio or Notepad to read the file.