What you are trying won't work.  The schema files (.xsd) don't determine how the game works.  The game determines what is in the schema files.

The schema files are just documentation of how the game works.  They allow verification that the data files are set up correctly to work with the game.  Changing the documentation doesn't change how the game works.

You need to look at the top of the data file(s) you're trying to edit to determine what schema files are used.  Then look at the top of those schema files to see what other schema files they use, then look at those schema files.  You may have to look at a few or a lot of schema files.  You will realize that some, maybe a lot, of the them don't apply to what you're trying to do, so you can ignore them and concentrate on the ones that do apply.  This should help you figure out what you need to do to get it right.  If you can't figure it out, take a break and try again later.

Booger, I was afraid that was the case. The way the BlackHoleLowDetailEffect is set up there's no other way round it. Is there any indication that this will be possible in the future for the game?

In any case thanks for your help, much appreciated

I'm new here so can't post on there but seen you've done it for me. Many many thanks