Umbraco-CMS/src/Umbraco.Core/Constants-System.cs

namespace Umbraco.Core
{
    public static partial class Constants
    {
        /// <summary>
        /// Defines the identifiers for Umbraco system nodes.
        /// </summary>
        public static class System
        {
            /// <summary>
            /// The integer identifier for global system root node.
            /// </summary>
            public const int Root = -1;

            /// <summary>
            /// The integer identifier for content's recycle bin.
            /// </summary>
            public const int RecycleBinContent = -20;

            /// <summary>
            /// The integer identifier for media's recycle bin.
            /// </summary>
            public const int RecycleBinMedia = -21;
        }

        public static class DatabaseProviders
        {
            public const string SqlCe = "System.Data.SqlServerCe.4.0";
            public const string SqlServer = "System.Data.SqlClient";
            public const string MySql = "MySql.Data.MySqlClient";
	    }
    }
}