We can create a language for it. It could be like HTML, using tags, but extensible, and the author could declare the schema of the information. You could even

We can create a language for it. It could be like HTML, using tags, but extensible, and the author could declare the schema of the information. You could even mix data from different schemas in the same document, using something like namespaces. Like, some kind of extensible markup language, almost.