Adrian,
I have some more information on the Coreldraw problem.
Firstly, the fish.svg does not open/import properly into CD10 either. It comes in black and white and a total mess.
Now, the good news. The fish.svg opens perfectly in Inkscape 0.42.
Colours and everything look great. It is present as a single group and I cannot ungroup it, so I cannot change colours, blends etc but at least I can see it. I can save in various vector formats but none of them will open/import into CD10 properly.
I can export as fish.png (this is a bitmap format) at any defined resolution and this will import into CD10 correctly. Normal export is about 90 dpi. This looked chunky so I exported to 200 dpi and then 1000 dpi. Both went very well. The file size at 1000 dpi was 457 KB. Once you are in CD10 you can save as a cdr file as usual and then import it whenever you want to use it. The colours, blends etc all appear to be correct.
OK. So for people who want the symbol to use in CD, a procedure is to import into Inkscape and then export as a png which CD can use.
I do not understand yet why I cannot break up the vector group after it gets into Inkscape. I'll keep working on this.
Now I then looked at the big svg files of symbols and they will also open in Inkscape. But they are sloooooooow. Think around 10-15 minutes to get the 20 MB file of terrestrial plants in but it does go in. Again it goes in as one group and this can be ungrouped twice to give individual symbols. These can be saved individually but it is a slow and tedious way to go.
I think that the size of the files is a problem. And they seem to have been grouped multiple times. And they use blends and maybe transparencies. All of these create slowness in svg and make a nightmare for saving in other vector formats.
OK. That's it for the moment.
cheers, Erik