/// <summary>
 /// Creates a new instance of XRefContainer.
 /// </summary>
 /// <param name="database">The drawing database to use.</param>
 /// <param name="transaction">The transaction to use.</param>
 internal XRefContainer(Database database, Transaction transaction)
 {
     this.database      = database;
     this.transaction   = transaction;
     xRefBlockContainer = new XRefBlockContainer(database, transaction);
 }