In a previous post about docpicture, I gave an example of a graphics generated from this site as something that would be desirable to do. (You can find more examples here.) Well, it turned out to be easy to do ... at the cost of a server connection. I used the example given to embed a graphics inside a page and ... voilà, it is done. As long as one has a live internet connection (and assuming the websequencediagram server is not down), a graphics is generated as requested.
Eventually, I still would like to implement my own parser to create svg code for uml sequence diagrams rather than relying on an external service.