this paper to describe hypermedia: a document is a complete collection of related components. Each component can be built recursively from other components or from primitive data elements of various types, also called entities. A presentation is the active form of a document. In normal use, the terms document and presentation are nearly interchangeable, as are (to a lessor extent) entity and component. Generally, context should clarify usage.

In this paper, we report about the design, development, and implementation of the SEPIA cooperative hypermedia authoring environment. It provides results on the following aspects of SEPIA: persistent and shared data storage, hypermedia data model with composites, sophisticated and comprehensive authoring functionality, support for a new rhetoric and for cooperative work. We start by identifying the challenge of hypermedia authoring and production which serves as the driving force for our development. Using interacting problem spaces as the vehicle for modelling the dynamic aspects of authoring, we arrive at a set of requirements answered by the concept of "activity spaces". The design of coherent hyperdocuments is facilitated by our "construction kit". Furthermore, we describe the extensions and modifications necessary to support multiple authors with the cooperative version of SEPIA. The central issue of the paper is the system architecture and its implementation. We describe the basi...

mproving the quality of hypermedia design and reducing its cost is an important challenge for the information industry. One way to tackle the problem is to provide hypertext designers with appropriate development environments. Hypertext engineering environments that provide sets of integrated tools boost designers ’ efficiency and effectiveness.

In this paper we discuss the architecture and implementation of CMIFed, an editing and presentation environment for hypermedia documents. Typically such documents contain a mixture of text, images, audio, and video (and possibly other media), augmented with user interaction. CMIFed allows the author flexibility in specifying what is presented when, using multiple simultaneous output channels. Unlike systems that use a timeline or scripting metaphor to control the presentation, in CMIFed the user manipulates a collection of events and timing constraints among those events. Common timing requirements can be specified by grouping events together in a tree whose nodes indicate sequential and parallel composition. More specific timing constraints between events can be added in the form of synchronization arcs. User interaction is supported in the form of hyperlinks. We place CMIFed in the context of the Amsterdam model for hypermedia documents, which formalizes the properties of hypermedia ...

this paper, we give a vision of third- and fourth-generation hypermedia, and some direction for developers to implement them on the web---and indeed in other information systems

The INEX'03 query language proved to be much too complicated for the INEX participants to use well, let alone anyone else. We need something simpler, but not too simple. Something which is basically a hybrid between Boolean IR queries and a stripped down CSS will do the job.

We present a model of hypermedia that allows the combination of “hyper-structured ” information with dynamic multimedia information. The model is derived by extending the Dexter hypertext reference model and the CMIF multimedia model. The Amsterdam hypermedia model allows the following, in addition to the model provided by Dexter: • the composition of multiple dynamic media, in order to specify a collection of time-based media making up a complete multimedia presentation; • the definition of channels for specifying default presentation information, allowing the specification of the presentation characteristics of nodes at a more general level than that for an individual node; • the composition of existing presentations into larger presentations, taking into account possible clashes of resource usage; • the inclusion of temporal relations while maintaining the separation of structure and presentation information, where time-based relationships are treated as presentation information; • the definition of context for the source and destination anchors of a link in order to specify the parts of a presentation affected on following the link. The Amsterdam hypermedia model enables the description of structured multimedia documents, incorporating time at a fundamental level, and extending the hypertext notion of links to timebased media and compositions of different media. The paper is organised as follows. The Dexter hypertext model and the CMIF multimedia model are summarised, and their limitations for use as a more general hypermedia model are discussed. The extensions included in the Amsterdam hypermedia model are described and a summary of the resulting model is given.

: Existing languages, formats, and multimedia document models such as HTML, MHEG, SMIL, HyTime, SGML, and XML, do not provide the appropriate modeling primitives needed to provide adequate support for reusability, interaction, adaptation, and presentation-neutral description of the structure and content of multimedia documents as required in the Cardio-OP project. Since each of these models lacks some significant concepts and does not meet all of the requirements, we propose a new approach for the semantic modeling of multimedia content, the Z Y X model, which we implemented on the basis of an object-relational database system. The approach taken allows for fine-grained representation and retrieval of structures and layout of multimedia material, for flexible on-the-fly composition of multimedia fragments in order to create individualized multimedia documents, and for the realization of adaptation and personalization of multimedia presentations depending on the user environment specifi...

Adatamodel and query language for accessing structured documents expressed in SGML is presented. The ELF #ELements with Features# model uses the SGML grammar #DTD# directly as a schema avoiding transformations which can lose information. The model also gives #exibility to the implementor to retrieve whole documents and decompose them, retrieve atomic elements and recombine them, or pursue alternatives which retrieve the elements directly. The language, Structured General- ized Query Language #SGQL#, allows e#cient access to the content, structure and attributes of documents at any level within their structure. This is all achieved with a simple, largely orthogonal functional language. 1

Existing multimedia document models like HTML, MHEG, SMIL, and HyTime lack appropriate modeling primitives that meet specific requirements given by advanced multimedia information system applications. In traditional multimedia applications, multimedia document models just had to cope with the modeling of the temporal, spatial, and interactive course of a multimedia presentation. However, we seriously question whether existing models fit the needs of next generation multimedia applications that bring up requirements like reusability of multimedia content in different presentations and contexts, and adaptation to user preferences. In this paper, we motivate and present new requirements stemming from advanced multimedia applications and the resulting consequences for multimedia document models. Along these requirements, we discuss HTML, HyTime, MHEG, SMIL, and Z Y X, a new model that has been developed with special focus on reusability and adaptation. The analysis and comparison...