"please click here"

The same problem with input devices: different devices provide different means for interaction.
Not every device has a mouse and a keyboard. Interaction needs to be specified independant of any devices used to interact!

W3C technologies: (same as presentation) + XFORMS for device independant data input, VoiceXML for speach dialogs;

Still not available: starting a session at a computer (e.g. planning a route) and continue the session in the car (reflect recent traffic news during the ride). Use keyboard, mouse, pen and  speech for input.

Has a session always to be bound to one device? Challenge: integrate several devices for input and output, simultaneously or serialised!

W3C technologien: (like dialogs) + EMMA for multimodal communication; related and new: Mobile Web Initiative

You book a travel on the internet. Wouldn't it be nice if after you have made your choices all the neccesary services would run automatically generating for you the complete itinerary, confirmations and invoices?

The problem is far from being new. RPC, CORBA, DCOM, EAI ... all addressed the Problem before. But doing it on the Web and basing it on XML adds new opportunities and challenges. Standards for interfaces, directories, processes, messaging and binding allow the exchange of messages between services and the assembly of services to form a process.

W3C technologies: SOAP1.2 for messaging; WSDL, description of interfaces; WS Choreography, definition of prozesses as an arrangement of services; WS Addressing, addressing of endpoints, passing of parameters.

... at the doctor's office, Lucy instructed her Semantic Web agent through her handheld Web browser. The agent promptly retrieved information about Mom's prescribed treatment from the doctor's agent, looked up several lists of providers, and checked for the ones in-plan for Mom's insurance within a 20-mile radius of her home and with a rating of excellent or very good on trusted rating services. It then began trying to find a match between available appointment times (supplied by the agents of individual providers through their Web sites) and Pete's and Lucy's busy schedules. (Aus "The semantic Web", Tim Berners-Lee et al., Sc. America 2001)

Agents "understand" content of queries and documents, agents exchange information, do reasoning and planning.

W3C-Technologien: RDF, metadata to describe the content of documents; OWL, ontologies, conclusions from metadata. No AI

Metadaten help to describe the web, Web Services can interpret, generate and compute metadata.

Web Services (process oriented) und Semantic Web ( data oriented ) have the potential to complement each other.

W3C technologies: The Semantic Web Services Interest Group discusses possible solutions

graphics, geography, simulations, interactive shows

markup for advanced multimedia that can be used on the web as well as on DVDs, animated grafics based on vectors or pixles.

W3C technologies: SVG vector graphics, anipation; PNG pixel graphics; SMIL synchronised multimedia