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Modelling web resources

Modelling web resources. Ketil Albertsen, Paradigma project National Library of Norway. Aggregates. Documents (in a bibliographic sense) spread over multiple web pages Web pages consisting of multiple visual/sound components, or traditional multipart documents

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Modelling web resources

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  1. Modelling web resources Ketil Albertsen, Paradigma project National Library of Norway

  2. Aggregates • Documents (in a bibliographic sense) spread over multiple web pages • Web pages consisting of multiple visual/sound components, or traditional multipart documents • Web pages requiring a style sheet, font file etc. for presentation (not directly visible to user) • Snapshots of a web page varying with time, the web version of integrating resources.

  3. Aggregates • Web documents available in multiple formats: HTML, PDF, DOC, … • Web pages providing information in alternative languages or adapted to several web browsers • Blogs and similar pages, the web version of incrementally issued continuing resources • Expressions based on multiple creative efforts: A song (melody + text), rewritings, …

  4. Claim:“Implicit” aggregates, based on objects having some common attribute value, are not sufficient • Inspecting candidate objects for common attribute values is costly, even when using indexes. • Access to attributes may require document interpretation, requiring knowledge of the format. • An aggregate may span only a subset of objects having a given attribute value. • Many aggregates are not based on stored, common object attributes. • Aggregates frequently need an ID and possibly a bibliographic description.

  5. Solution: Aggregate objects, ”boxes” • General container objects holding (references to) other objects. • Boxes can be identified and described as composite objects. • The model defines classes of boxes, each class identifying a set of structural properties. • The application/user may identify multiple applications of each box class.

  6. Box classes(suggested) • Component: Ordered, all components presented • Variant: Unordered, one of several. • Synchronous: Parallel presentation in real time. • Update: Later components replace earlier ones, “integrating” CR • Extension: Later components are added to earlier ones, “successively issued” CR. • Based On: One component is a further development of one or more other components. • Fragment Of: One component is part of another one.

  7. Box class properties • Cardinality, i.e. 1:n, m:n, 1:1 • Existence, i.e. will removal of one component imply removal of another • Dependency, e.g. a component depends on a whole • Recursion, e.g. a chapter may contain subchapters • Ordering, usually in time or space • Reference, does a dependent component have an independent value or is it integrated with the other object?

  8. Other Paradigma extensions • Agent objects, for modeling real world objects that cannot themselves be digitized. • Point/fragment reference objects(further discussed tomorrow)

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