1 / 23

An RMM-Based Methodology for Hypermedia Presentation Design

An RMM-Based Methodology for Hypermedia Presentation Design. Flavius Frasincar Richard Vdovjak Geert-Jan Houben. Databases & Hypermedia Group Department of Informatics. Contents. Motivation Goals Context: Hera Architecture Design Methodology Application Diagram Presentation Diagram

odell
Download Presentation

An RMM-Based Methodology for Hypermedia Presentation Design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. An RMM-Based Methodology for Hypermedia Presentation Design Flavius Frasincar Richard Vdovjak Geert-Jan Houben Databases & Hypermedia Group Department of Informatics ADBIS'2001

  2. Contents • Motivation • Goals • Context: Hera Architecture • Design Methodology • Application Diagram • Presentation Diagram • Prototype: XML/XSL • Further Work ADBIS'2001

  3. 1. Motivation • There are a lot of methodologies for manual hypermedia presentation design but not for an automatic one. • The need for presentation automation is justified by the fact that a lot of data is nowadays residing in the heterogeneous ‘deep web’ (searchable databases) as opposed to the ‘surface web’. • There is an increasing need for presentation adaptation for different users/user platforms. ADBIS'2001

  4. Deep Web • Deep Web vs. Surface Web: • 500 times larger • 1000 times better quality ADBIS'2001

  5. 2. Goals Develop a methodology that supports automated hypermedia presentation design for Web-based Information Systems (WIS) that: • Integrates heterogeneous data sources. • Facilitates presentation (server/client-side) adaptation: • Network (T1, 128K, 56K etc.) • Display (PC, Palm, WAP Phone etc.) • User (preferences, interaction history etc.) • Enables semi-structured data queries. ADBIS'2001

  6. Relational Database Object-Oriented Database XML Database … RDB-XML Wrapper ODB-XML Wrapper Mediator/ Integrator Information Retrieval Hypermedia Presentation Logical Presentation Logical-HTML Presentation Logical-WML Presentation Logical-SMIL Presentation HTML Presentation WML Presentation SMIL Presentation Query … 3. Context: Hera Architecture ADBIS'2001

  7. 4. Design Methodology • Based on RMM (Relationship Management Methodology). • It distinguishes two levels: • Logical level: groups data into meaningful content units, called Slices. • Artifact: Application Diagram • Presentation level: translates slices to presentation units, called Regions. • Artifact: Presentation Diagram ADBIS'2001

  8. Methodology Phases Application Design Presentation Design Requirements Analysis E-R Design Implementation E-R Diagram Application Diagram Presentation Diagram Phase Artifacts: • Slice • Slice Relationship • Region • Region Relationship • Entity • Relationship (Application Model) (Conceptual Model) (Presentation Model) ADBIS'2001

  9. 5. Application Diagram • Based on the concept of slice which groups together attributes (having specific media types) and possibly other slices. • Extends the E-R Diagram, each slice belongs to an entity. • Slices are linked together with slice relationships: • Aggregation relationships: index, tour, indexed guided tour etc. • Reference relationships: link with an anchor specified. ADBIS'2001

  10. Application Diagram Example ADBIS'2001

  11. 6. Presentation Diagram • Based on the concept of region which contains attributes and possibly other regions. • Each region has a rectangular area associated. • Slices are translated to regions, one slice can be mapped to several regions. • Slice relationships are materialized with: • Navigational relationships • Spatial relationships • Temporal relationships ADBIS'2001

  12. Region Relationships • All region relationships can be guarded by a condition and/or an event. • Navigational relationships: represent the classical hyperlinks. Possible events are: mouse-click, mouse-over etc. • Temporal relationships: have associated a timeout event (e.g. time based on a media play duration). • Spatial relationships: specify a relative position (qualitative or quantitative) between two regions. ADBIS'2001

  13. Presentation Diagram Example ADBIS'2001

  14. Synchronization Petri-net like notation for expressing synchronization (typical for multimedia data). • Temporal • Multidimensional ADBIS'2001

  15. 7. Prototype: XML/XSL • Implements the logical level of the design methodology. • Based on transformation steps encoded in XSL stylesheets that describe to an XSLT processor how to convert the input XML file to the desired output XML file. • Tool: XSLT processor from Apache XML Project. ADBIS'2001

  16. Prototype Steps ADBIS'2001

  17. Data Retrieval • Retrieved data is an instance of the conceptual model. DTD XML <entity-class id=“entity.painter”> <entity-instance id=“ID_0”> <attribute-instance id=“attribute.painter.name”> <![CDATA[Rembrandt Harmensz. van Rijn]]> </attribute-instance> </entity-instance> </entity-class> <!ELEMENT entity-class (entity-instance)*> <!ATTLIST entity-class id ID> <!ELEMENT entity-instance (attribute-instance)*> <!ATTLIST entity-instance id ID> <!ELEMENT attribute-instance (#PCDATA)> <!ATTLIST attribute-instance id CDATA> ADBIS'2001

  18. Data Cleaning • Enriches the retrieved data with information from the application domain model (appropriate relationship names, inverse of relationship instances). XSL <xsl:when test=“@id=‘painting-technique’”> <xsl:attribute name=“id”>relationship.exemplifies</xsl:attribute> </xsl:when> ADBIS'2001

  19. Application Model • Describes at logical level the hypermedia aspects of the application. DTD XML <!ELEMENT slice (text | (slice-ref | hyperlink | index | guided-tour))> <!ATTLIST slice id ID> <!ATTLIST slice owner IDREF> <slice id=“slice.painting.main” owner=“entity.painting”> <slice-ref idref=“attribute.painter.name”> relationship-ref=“relationship.painted_by”/> … </slice> ADBIS'2001

  20. Logical Transformation Generation • Builds the main transformation engine that packages the retrieved data into slices using the application model. <xsl:stylesheet xmlns:xsl=“http://www.w3.org/1999/XSL/Transform” xmlns:axsl=“http://www.w3.org/1999/XSL/TransformAlias”> <xsl:template match=”/”> <axsl:stylesheet> <axsl:template match=”/”> … </axsl:template> </axsl:stylesheet> </xsl:template> … </xsl:stylesheet> XSL ADBIS'2001

  21. Logical Transformation • Packages the retrieved data into slices based on the stylesheet generated by the previous step. XSL <text> <axsl:value-of select=“attribute-instance[@id=‘attribute.painting.main’]”/> </text> ADBIS'2001

  22. Presentation Transformation • Implements the presentation. • There are two code generators built for: HTML and WML. WML XSL HTML XSL <xsl:template match=“slice-instance”> <TABLE> <xsl:apply-templates select=“*”/> </TABLE> </xsl:template> <xsl:template match=“slice-instance”> <CARD id=“{@id}”> <xsl:apply-templates select=“*”/> </CARD> </xsl:template> ADBIS'2001

  23. 8. Further Work • Add media types to the model (now: strings and URLs). • Build slices-on-demand on a servlet (now: precomputed). • Implement the presentation level of the proposed methodology. • Make use of query technologies for XML and RDF: XQuery and RQL (now: SQL). • Experiment with different kinds of applications (e.g. Electronic TV-Program Guide). • Use Semantic Web: model descriptions in RDF(S). • Taxonomies of classes/properties based on inheritance. ADBIS'2001

More Related