Good, thank you very much. I see that it might be easier and maybe even simple to use what is in ft_backlinks function to create the same effect. And with metadata, even better.
And I've checked different javascript library, but I prefered visnetwork with R for the nice layout and different possibilties. Is R not install on any VPS that runs with Debian ? But a simpler version could be rendered with javascript.
Another question I had is : Do you thinlk this kind of representation would be usefull and/or interesting ? My initial thought was to see the network digram being constructed as the wiki get built. You would then see unexpected link and correlation between different concepts/areas of the wiki ? For a large topic, you could discover parrallels and assiciation patterns relatively easely (see orphean pages, clusters, etc.) . The key is that the database to create the network is created every time you create content and link them together. Without this feature, it is usually a dauting task to extracting data to create network analysis and so it never happens.
Thanks