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By Renata de Matos Galante, Nina Edelweiss, Clesio Saraiva dos Santos (auth.), Antoni Olivé, Masatoshi Yoshikawa, Eric S. K. Yu (eds.)

The goal of the workshops held at the side of ER 2002, the twenty first foreign convention on Conceptual Modeling, was once to offer contributors the opportunitytopresentanddiscussemerginghottopics,thusaddingnewpersp- tives to conceptual modeling. to satisfy this goal, we chosen the subsequent 4 workshops: – 2d InternationalWorkshop on Evolution and Changein info administration (ECDM 2002) – ER/IFIP8. 1 Workshop on Conceptual Modelling techniques to cellular - formation structures improvement (MobIMod 2002) – foreign Workshop on Conceptual Modeling caliber (IWCMQ 2002) – third foreign Joint Workshop on Conceptual Modeling techniques for E-business: an online provider viewpoint (eCOMO 2002) ER 2002 was once equipped in order that there will be no overlap among the c- ference classes and the workshops. This complaints comprises workshop papers that wererevisedby the authors following discussions throughout the convention. we're deeply indebted to the individuals of the organizing committees and application committees of those workshops for his or her labor. July 2003 Antoni Oliv´ e, Masatoshi Yoshikawa, and Eric S. okay. Yu Workshop Co-chairs ER 2002 ECDM 2002 swap is a basic yet occasionally overlooked element of data and database platforms. The administration of evolution and alter and the facility of database, info and knowledge-based platforms to house swap is an integral part in constructing and preserving actually valuable platforms. Many approachestohandlingevolutionandchangehavebeenproposedinvariousareas of information administration, and this discussion board seeks to collect researchers and practitioners from either extra proven parts and from rising components to examine this issue.

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Extra resources for Advanced Conceptual Modeling Techniques: ER 2002 Workshops, ECDM, MobIMod, IWCMQ, and eCOMO, Tampere, Finland, October 7-11, 2002. Revised Papers

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The state consisting of tuples having the transaction time with +∞ as upper bound): valid time of this tuple confirms that the reservation of Jones was valid from its definition up to now. The table RentalData is the following: Towards Temporal Information in Workflow Systems CaseId 47 48 47 47 48 Cname Smith J. Jones J. Smith J. Smith J. Jones J. Car Ferrari Lotus Ferrari Fiat Lotus RentDate 01-12-01 02-02-01 01-12-01 01-12-01 02-02-01 RetDate 02-01-06 02-02-02 02-01-06 02-01-07 02-02-03 Avlb yes no yes yes no VT [01-11-12 ÷ +∞] [01-08-02÷ +∞] [01-11-12 ÷ 01-11-21] [01-11-21 ÷ +∞] [01-08-02÷ +∞] 21 TT [01-11-12 ÷ 01-11-21] [01-08-02 ÷ 01-08-03] [01-11-21 ÷ +∞] [01-11-21 ÷ +∞] [01-08-03÷ +∞] As for historical data of the information model, by a TDBMS we are able to manage in a homogeneous way temporal data already present into the database and explicitly managed by the WfMS as user-defined times.

Support for Complex Queries. Efficient indexing schemes [15] and query processing algorithms [14] can be used to support complex queries on multiversion documents. For instance, multiversion B-Trees (MVBT) [5] indexing is used to support complex queries. The MVBT is a directed graph with multiple roots, and each root is associated with a consecutive version interval. Finally, while complex operators such as coalesce can be expressed directly in XQuery, much faster execution can be achieved by their direct implementation as built-in primitives.

9. : Change Detection in Hierarchically Structured Information. Proc. ACM SIGMOD (1996). 10. : Universal Temporal Extensions for Database Languages. ICDE (1999) 428-437. 11. : Version Management of XML Documents. WebDB 2000 Workshop, Dallas, TX (2000) 75-80. 12. : Copy-Based versus Edit-Base Version Management Schemes for Structured Documents. 11th RIDE Workshop (2001) 13. : Efficient Management of Multiversion Documents by Object Referencing. Proc. VLDB (2001). 14. : Efficient Complex Query Support for Multiversion XML Documents.

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