Sorter and up-to-date architecture text and diagram

The diagram is obviously temporary, but I wanted to agree on the general shape before investing time in doing it with a proper tool (nothing as fast as good old pen).
Apart from the link, that is clearly missing, I wanted to mention term and path explicitly because the rest of the types are pretty obvious for the average programmer, but these two look more alien. I feel that most people willing to contribute will not need to read the full YCP specification, but will certainly welcome some lines about term and path.