private void _add(string key, Collector value)
{
this.Add(key, value);
}
/// <summary>
/// Appends a property/field to this collector.
/// </summary>
/// <param name="key">Name of containing property</param>
/// <param name="data">Data to be appended</param>
/// <returns></returns>
public Collector Append(string key, Collector value)
{
this.Add(key, value);
return(this);
}