Use the following procedure to get the schema of a particular SharePoint list.

1. Get the List Guid

  1. Go to the site contents of the site
  2. Select the list
  3. Select List settings from the Settings Icon
  4. The Guid is the alpha-numeric between %7B and %7D

Enter the following URL
http://ServerName/_vti_bin/owssvr.dll?Cmd=ExportList&List={GUID} replacing {GUID} with the list Guid

A file named owssvr.xml file will be downloaded. That will be the Schema.xml file of the list.