<DataCompare>
     <TableDefinition name="DefinitionName1" table="TableName">
        <keys>
         <Key>Key1</Key>
        </keys>
        <Columns>
         <Column>Column1</Column>
         <Column>Column2</Column>
        </Columns>
    </TableDefinition>
 </DataCompare>

public class EVVCompareFactory
    {
        public static IList<Object> /*IList<ISource>*/ GetITables(string driverFile)
        {
            GetIColumnDefinitions(driverFile);

            return null;
        }
        public static IList<Object> /*IList<IColumnDefinition>*/ GetIColumnDefinitions(string driverFile)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(driverFile);

            XmlNodeList columnDefinitionNodes = doc.DocumentElement.SelectNodes("/DataCompare/Sources/ColumnDefinitions/ColumnDefinition");
            foreach (XmlNode node in columnDefinitionNodes)
            {
                //Create new class called IColumnDefinition, which will implement a class called ColumnDefinition
            }

            return null;
        }
    }