Ok, I have solved alla problems and now I can get my feed file.

The only problem remaining is that accented letters are not stripe correclty from html

For instance à becomes à
This is not liked by goggle which refuses the products containing that.

I have been looking around a lot but I can not find a solution.
By now I have created a macro in notepad++ and I run it on the file before uploading it to google, but this exclude the possibility of any automation of the system.

My db product_description collation is latin1_general_ci.
If someone can help, is very welcome.
Thanks
enzo