The second paper I presented was about the building=yes project. It is very much a technical paper going over the nuts and bolts of extracting the data (from OpenStreetMap), indexing it and designing custom map tiles to help make sense of the sheer volume of data. Rather than try to cram all that information in to a 15 minute talk I instead talked about the overall value – the purpose – of creating these kinds of registries and tried to highlight the importance of being patient. It’s not always clear what will come out of these kinds of projects but what is clear is that stable, linkable things that can hold hands with one another are the foundation on which all the interesting stuff will be built.