> I m newbie in xsl. 

You're a newbie to this list too; otherwise you would know that we're better
at finding errors in code when we can see it than when we have to guess.

> I have a gml(geography Markup Language)file that 
> I tried to transform it to svg format using xslt but the 
> result is always a white page.
> 
> <CityModel xmlns="http://www.opengis.net/examples" 

Perhaps you didn't notice that all the elements are in a namespace.

Michael Kay