thanks a lot for the code and the comments,
by the way

>   Any attempt to create a proper template has encountered some xsl
>   limitation :
>   impossibility to open and close an element in two separate templates
>   impossibility to change variable values at runtime.
> 
> Neither of those things is an XSLT limitation.
> 
> The first is a basic rule of XML, nothing specific about XSLT, element
> structure has to be well formed, ie properly nested.
> The second is just a feature of declarative programming languages, but
> these are computationaly equivalent to imperative programming languages,
> so this is not, itself, a limitation.
> 

I know those are features, and not limitations, I was using an approach
not siuted for this language.

bye