@MickJT
A central source of explanations for why and when these options should be used would be nice. Spot's guide summarizes possible options, but the explanations are missing. aren't they (-- though, I could be wrong because I had only a quick look into it so far)?
Actually, I'm trying to avoid to spend time on looking for information all around the web but like to spend my little time on understanding the issues when information is available (due to suffering by a permanent lack-of-time syndrome which is currently even worse than usual)
On the other hand, I have some nice ideas in mind about what could be done with Clucene ..
Anyway, thanks for your help.
nexus