Hi Helge,
1) as I read above, problem is not in us, but in Xojo and plugin support?
I have go to that page Sergey points and reading
Most plugins are built using a shared library. Shared libraries are not supported by Apple for iOS. We are exploring other methods of providing third party plugin support.
well, as for me ... Xoxo could use static library, why not ... although they need to find way to link it.
2) what can do postgre? working from Xojo as plugin?
3) In fact with 6.0 we introduce for VSERVER the REST API.
This is near to ideal way to access VSERVER without any binary CLIENT
This means that you can access VSERVER from any language and OS, which have sockets.
Including iOS, Android and WinMobile right now ...
Including python, and other languages to which we not provide native SDKs.
You can ready article about this way in our new WIKI v6
http://www.valentina-db.com/docs/dokuwiki/v6/doku.php?id=valentina:articles:vserver_rest