Where is the difference between locating and identifying a resource? [duplicate]

Question

Possible Duplicate:
What's the difference between a URI and a URL?

Is there any difference? I'm talking about URI for identifying, but URL for locating. Aren't both the same thing?

Answer 1

They can look the same, but they're not the same thing. A URL identifies something that can be transferred over some protocol (often http). A URI, can be used to identify a namespace (for example) but there might not be any content at the address.

Answer 2

Where is the difference between locating a ressource and identifying a ressource?

Knowing who I am doesn't tell you anything about where I am.