Why is the Uri Fragment ignored in the Equals method?

Question

I am trying to save a collection of objects based on their URI:

public class ConceptCollection : KeyedCollection<Uri, Concept> {
    protected override Uri GetKeyForItem(Concept item) {
        return item.Uri;
    } 
}

However, the URI is regularly differentiated only based on the Uri fragment. Thus, the following causes the error:

ConceptCollection wines = new ConceptCollection();
Concept red = new Concept("http://www.w3.org/2002/07/owl#RedWine");
Concept white = new Concept("http://www.w3.org/2002/07/owl#WhiteWine");
wines.Add(red);
wines.Add(white); // Error: An item with the same key has already been added.

Per http://msdn.microsoft.com/en-us/library/f83xtf15.aspx :

The Equals method compares two instances without user information (UserInfo) and the fragment (Fragments) that they might contain. For example, given the URI http://www.contoso.com/index.htm#search as well as http: // user: [e-mail] /index.htm , the Equals method will return true.

I put up with the need to crack it. But why does he act like that? I see the logic for user-info, but not for the fragment.

Answer 1

RFC 2396:

4,1.

URI , , URI ( "#" ), , . , URI, URI.

, Uri.Equals.

URI , , : http://www.w3.org/2002/07/owl

.

Answer 2

, 2 URI, , , , .

, : " ?" , .