Libraries have uris not urls. Scripts have uris not names.

runtime/vm/service/service.md

 # Dart VM Service Protocol 0.0
 
 This document describes _version 0.0_ of the Dart VM Service Protocol.
 This protocol is used to communicate with a running Dart Virtual
 Machine.
 
 To use the Service Protocol, start the VM with the *--observe* flag.
 The VM will start a webserver which services protocol requests via WebSocket.
 It is possible to make HTTP (non-WebSocket) requests,
 but this does not allow access to VM _events_ and is not documented
@@ skipping 1332 matching lines @@
 
 An _Isolate_ object provides information about one isolate in the VM.
 
 ### Library
 
 ```
 class @Library extends @Object {
   // The name of this library.
   string name;
 
-  // The url of this library.
-  string url;
+  // The uri of this library.
+  string uri;
 }
 ```
 
 _@Library_ is a reference to a _Library_.
 
 ```
 class Library extends Object {
   // The name of this library.
   string name;
 
-  // The url of this library.
-  string url;
+  // The uri of this library.
+  string uri;
 
   // A list of the imports for this library.
   @Library[] imports;
 
   // A list of the scripts which constitute this library.
   @Script[] scripts;
 
   // A list of the top-level variables in this library.
   @Field[] variables;
 
@@ skipping 144 matching lines @@
   OptimizedOut
 }
 ```
 
 A _SentinelType_ is used to distinguish different kinds of _Sentinel_ objects.
 
 ### Script
 
 ```
 class @Script extends @Object {
-  // A name for this script.
-  string name;
+  // The uri from which this script was loaded.
+  string uri;
 
   // What kind of script is this?
   string kind;
 }
 ```
 
 _@Script_ is a reference to a _Script_.
 
 ```
 class Script extends Object {
-  // A name for this script.
-  string name;
+  // The uri from which this script was loaded.
+  string uri;
 
   // What kind of script is this?
   ScriptKind kind;
 
   // The library which owns this script.
   @Library library;
 
   // The source code for this script.  For certain built-in scripts,
   // this may be reconstructed without source comments.
   string source;
@@ skipping 215 matching lines @@
   // A list of isolates running in the VM.
   @Isolate[] isolates
 }
 ```
 
 ## Revision History
 
 version | comments
 ------- | --------
 0.0 | draft