I've posted the diagram of Shedroff's model before, so I won't post it again. In Shedroff's model, knowledge includes conversation, storytelling, and the integration of data in a localized context. Knowledge occurs after information is organized and presented, and because of a stimulus. It is part of experience, and leads to understanding. Understanding occurs on a personal level, because of contemplation, evaluation, interpretation, and retrospection.
This ties in with Weinberger's statement that "understanding is metaknowledge". The ability to understand on a semantic web level relies on the ability to take metadata, or the description of data (data about data, so to speak), put it all together, and look at the global picture. Metaknowledge is like Shedroff's "wisdom" circle, in that the person learning has taken their knowledge (metadata) and evaluated it, based on a relationship model, to decide how it fits in with the entire collection of metadata.
I would conclude that Weinberger is re-stating Shedroff's model in light of technological advances (the semantic web, RDF, etc.).
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