QUrl Class's *addQueryItem* method

[TheIndependentAquarius]

I want to query the Google map for all the roads leading to a given GPS coordinate.
For that I'll have to place a "query" which can be done by: http://doc.qt.nokia.com/latest/qurl.html#addQueryItem


Now I want to know how to figure out that what should be the key and its corresponding value here?


Should the key be "road"/"roads"? Whats the way to decide that? And I want all the roads not a particular one!


Any hints?

[TheIndependentAquarius]

Helpful link: http://mapki.com/wiki/Google_Map_Parameters