A set of XML-based markers includes an event marker indicating an event, a condition marker indicating a state of a first media object, and an action marker indicating a second media object, an attribute of the second media object, and a value of the attribute. The optical fibers in the extension portions 10 are covered with protective tubes 5 for protecting the optical fibers. Both trenches are lined with a diffusion barrier layer, and a first conductive layer is deposited over the diffusion barrier layer. Also a method or system is provided for automatic generation of messages in an electrophotographic printer or copier wherein a text message that contains at least an error code is automatically generated with aid of a data processing system after occurrence of a preset error state.