/// <summary>
/// Converts an <see cref="CX"/> instance to an <see cref="EntityIdentifier"/> instance.
/// </summary>
/// <param name="identifier">The identifier to be converted.</param>
/// <returns>Returns the converted identifier.</returns>
public static EntityIdentifier ToModel(this CX identifier)
{
return(new CX[] { identifier }.ToModel().FirstOrDefault());
}
