Our results show that for half of selected web sites, there exists only one creator at every access site. And in fewer than 50\% of web sites, there exists more than one creator, though the total number of access sites with multiple creators is extremely small.
However, our results show that the types of the properties in objects do sometimes change, especially in objects generated from user-defined functions. Thus, even if objects are mostly from one creator, that creator may not correspond neatly to a type. This may limit the advantages of using types for better performance.