TD APIs/command line

> I am working in some project where the Target Designer needs to be
> called from some front-end process. However I am not sure whether this
> could be done. The idea is to provide the user with a list of
> components from where he/she can choose and build the .sld file from
> that and call TD with that file to generate the image. I have the
> following questions:
>
> 1) Is it posssible to build an .sld file from the user selection
> manually?(since after all, this is an xml file).
>
> 2) Would it be possible to use the TD like this? I found neither
> command line which takes an .sld file as arguement nor any APIs.
>
> 3) If it cannot be done this way, could anyone suggest me some other
> approach to achieve this?
>
> Any help will be highly appreciated.
> Thanks.
>
> -P.