RSS 1.0 combines extensibility with simplicity. RSS 0.91 took those out, but added in more information like description and publisher. We took the best bits from 0.9 and from 0.91 and put them together for 1.0. Attributes are named properties of the elements, which have values. All the triples result in a directed labeled graph, whose nodes and arcs are all labeled with qualified URIs.
Graphs are important because they define the data set and all the relations between the data.
Without them, focusing solely on the XML representation, you just have an overly complex, verbose method of sending strings. Both groups have good goals, but they are slightly different, which makes communication difficult. Because of them, you can combine multiple RDF documents into a combined graph, containing the data of all them and allowing you to see connections between documents that you wouldn't see otherwise. Tim Berners-Lee provides an example of this . This means for 0.9 there is no relationship between the channel and the image or textinput, but with 1.0 there is.