iPhone SDK: What NSURL methods actually return

Apple's NSURL documentation has very little detail on what exactly the various NSURL methods actually return. It just says unhelpful things like 'returns the path' - what path?

Here's an example NSURL, and the output you actually get when using some of the methods.

NSURL* url = [NSURL URLWithString:@"http://username:password@www.example.com:888/folder1/folder2/filename.html?query1=value&query2=value#anchor1"];
[url scheme] -> "http"
[url user] -> "username"
[url password] -> "password"
[url host] -> "www.example.com"
[url port] -> "888"
[url path] -> "/folder1/folder2/filename.html"
[url lastPathComponent] -> "filename.html"
[url pathExtension] -> "html"
[url fragment] -> "anchor1"
[url absoluteString] -> "http://username:password@www.example.com:888/folder1/folder2/filename.html?query1=value&query2=value#anchor1"