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keep upper compatibility with XML as de facto standard and we use extended
features. The semantics of extended features must be formalized, because it becomes
too complex to follow the procedures as in the original XML. We had better add
one advantage of our approach: that is, in this approach, it is rather easy also to
introducing other additional features. However we have to introduce a language,
QUIK, to represent and synchronize multimedia objects, and make interactive
presentation possible.
We summarize the features of our model proposed in this article:
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Management of Heterogeneous Documents
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We can use various constructors as in conventional data models.
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We can define reference relations by identifiers and equality constraints,
especially the latter of which is useful for describing partial information.
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We can describe logical elements, which might be against the syntax
of XML.
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We can specify a set of documents with a content, naturally as a logical
unit.
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We can use navigation though links declaratively as transformation of
subgraphs to access paths.
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We can treat both shared and personal information uniformly.
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It is easy to extend and implement our extensions.
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Interactive presentation
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We can specify temporal and spatial layouts of multimedia information.
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We can interpret an XML document as a QUIK program and present
multimedia information as a result of the interpretation.
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A user interrupts the execution (or presentation) at any time, modify
multimedia objects and their layouts, and restart the presentation from
any point.
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We can store a QUIK program as an XML document in a database.
As future works, we consider the followings:
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Details of the formal semantics based on hypersets
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Implementation of extended XML
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Implementation of viewer (as a plug-in) and authoring tool
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Introduction of type information
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Design of a user-oriented query language
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Applications
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Literature, documents, theme parks, and digital museum
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Consistency with a DOOD language QUIK
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Implementation of interactive drama performance and direction
