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StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append(" <Where>");
stringBuilder.Append(" <Or>");
stringBuilder.Append(" <Eq>");
stringBuilder.Append(" <FieldRef Name=\"ContentType\" />");
stringBuilder.Append(" <Value Type=\"Text\">My Content Type</Value>");
stringBuilder.Append(" </Eq>");
stringBuilder.Append(" <IsNotNull>");
stringBuilder.Append(" <FieldRef Name=\"Description\" />");
stringBuilder.Append(" </IsNotNull>");
stringBuilder.Append(" </Or>");
stringBuilder.Append(" </Where>");
stringBuilder.Append(" <GroupBy>");
stringBuilder.Append(" <FieldRef Name=\"Title\" Ascending=\"False\" />");
stringBuilder.Append(" </GroupBy>");
stringBuilder.Append(" <OrderBy>");
stringBuilder.Append(" <FieldRef Name=\"_Author\" />");
stringBuilder.Append(" <FieldRef Name=\"AuthoringDate\" />");
stringBuilder.Append(" <FieldRef Name=\"AssignedTo\" Ascending=\"True\" />");
stringBuilder.Append(" </OrderBy>");
string query = stringBuilder.ToString();