// example 1: how we currently do it

public class ClassMap<T>
{
  private List<PropertyPart> propertyParts = new List<PropertyPart>();

  public PropertyPart Map(...)
  {
    var part = new PropertyPart(...);

    propertyParts.Add(part);

    return part;
  }

  public ClassMapping GetMapping()
  {
    var mapping = new ClassMapping();

    foreach (var propertyPart in propertyParts)
    {
      var propertyMapping = propertyPart.GetMapping();

      mapping.AddProperty(propertyMapping);
    }

    return mapping;
  }
}