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- IDs are strings which can be concatenated together like paths. - Isolate ID is now "/isolates/XXX" - Function, field, class, library, and script IDs are now stable. - Introduce <type-ref> tags. R=turnidge@google.com Review URL: https://codereview.chromium.org//98253009 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@31358 260f80e4-7a28-3924-810f-c04153c831b5