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1) The Web is a set of resources.
2) You can't squash a Web resource into your browser/viewer/client. But you can fetch a representation of it (which may be highly customized to suit you).
3) This representation may itself be a bunch of resources (paragaraphs, thumbnail images, sound clips). They can have identifiers. The representation has a local namespace for these identifiers.
So, to wrap it all up: there are 2 levels of resource because the act of "getting a representation" has 2 sides.
One one side, there is the space of Web resources. On the other, your representation.
The Web architecture mandates no more fundamental
acts that you can carry out on your representation, so there are no more fundamental levels of resource.
At least, that's how I explain it.
David Byrden
http://Byrden.com
Technology trainer
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