Elena asked about it few days ago on TB-SUPPORT. Today I investigated a bit further and the result is that for glite-yaim-core versions >4.0.4-1:
* Even if it still works the syntax with VO= and GROUP= is obsolete. The new syntax is much simpler as it uses directly the FQANs as reported in the VO cards (if they are maintained).
* The syntax in /opt/glite/yaim/examples/groups.conf.example is correct and the files in the directory are kept up to date with the correct syntax although the examples might not be valid.
* Further information can be found either in
which is worth to periodically review for changes.