Thanks again Mike ... I've just been having a play with explorer and, on the face of it, there is an option to select the census fact along with a 'not exists', but it's not quite the full solution. The scenario is ... I have a spare hour and I want to produce a list of all the people who should be on the 1851 census, but I haven't found yet. In terms of the data, this means that there won't be a census fact containing 1851 in the date, but there may be others, for the other census entries that I may have found (1861, 1871 etc). Because, as I said, TMG doesn't have a 'not exists' condition, I've created a set of flags (which when you create them, are applied to everyone in the project and set to a default value) for each of the censuses, which I then set to 'Y' when I find someone. It's then very easy to produce a list based on 'On 1851 Census = N'.
I have looked at the possibility of designing a new 'fact type' for this purpose, but there doesn't appear to be a way of assigning this to everyone, so I don't really think it's an option as I have thousands of people that I'd have to go through individually, unless I'm missing something.
Any bright ideas would be very welcome.
