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ICDT '97 Program and Call for Participation

Conferences Directory - Previous Article - Next Article

From: Phokion G. Kolaitis <>

Call for Participation


(ICDT '97)

Delphi, Greece, January 8-10, 1997

In cooperation with

ICDT is a biannual international conference on theoretical aspects of databases and a forum for communicating research advances on the principles of database systems. Previous ICDT conferences were held in Rome (1986), Bruges (1988), Paris (1990), Berlin (1992), and Prague (1995). Since 1992, ICDT has been merged with the Symposium on Mathematical Fundamentals of Database Systems (MFDBS), another series of conferences on theoretical aspects of database systems that was initiated in Dresden (1987), and continued in Visegrad (1989) and Rostock (1991).


  • Invited talks by S. Abiteboul and J. Ullman
  • Invited tutorial on data mining by H. Mannila
  • Presentations of 29 technical papers selected out of 119 submissions


Speaker: S. Abiteboul (INRIA and Stanford University)
Title: Querying Semi-Structured Data
Semi-structured data can be found in many data sources available electronically (most notably in the WWW). They also arise naturally as the result of the integration of independent heterogeneous sources. In such contexts, the structure of data is not as regular or rigid as in standard databases systems, e.g., in the relational or object-oriented database systems. Also, the notion of schema is altered in essential ways, e.g., the schema may become implicit.
We will try to highlight the main aspects and particularities of semi-structured data. We will also survey some proposals of models and query languages for semi-structured data.
About the speaker:
Serge Abiteboul obtained his Ph.D. from U.S.C, Los Angeles, in 1982, and a Th`ese d'Etat from Paris University, Orsay, in 1985. He is Senior Researcher at I.N.R.I.A., Rocquencourt, France where he managed a Database Group from 1989 to 1995. He is also Maitre de Conf'erence at Ecole Polytechnique. He is currently visiting for two years the Computer Science Dept. at Stanford U.

Speaker: J. Ullman (Stanford University)
Title: Information Integration Using Logical Views
A number of ideas concerning information-integration tools can be thought of as constructing answers to queries using views that represent the capabilities of information sources. We review the formal basis of these techniques, which are closely related to containment algorithms for conjunctive queries and/or datalog programs. Then we compare the approaches taken by AT&T Labs' "Information Manifold" and the Stanford "Tsimmis" project in these terms.
About the speaker:
Jeff Ullman is the Stanford W. Ascherman Professor of Engineering and acting chair of the Department of Computer Science at Stanford. He received the B.S. degree from Columbia University in 1963 and the PhD from Princeton in 1966. He has served as chair of the CS-GRE Examination board, Member of the ACM Council, Chair of the New York State CS Doctoral Evaluation Board, on several NSF advisory boards, and is past or present editor of several journals. He is presently a member of the Computing Research Association Board. Ullman was elected to the National Academy of Engineering in 1989, has held Guggenheim and Einstein Fellowships, and is the 1996 winner of the Sigmod Contributions Award. He is the author of 14 books, including a 2-volume series on Database Systems. His research interests include information integration, warehouse design, and data mining.


Speaker: H. Mannila (University of Helsinki)
Title: Methods of data mining
Data mining, also called knowledge discovery in databases, aims at the discovery of interesting knowledge from large masses of data. We review some recent developments in data mining methods for relational, sequential, and time-series data, and present some theoretical results and challenges in the area.
About the speaker:
Heikki Mannila is a professor of computer science at the University of Helsinki, where he also obtained his Ph.D. in 1985. After that he has been an associate professor at the Universities of Tampere and Helsinki, a visiting professor at the Technical University of Vienna, and a guest researcher at the Max Planck Institut fur Informatik in Saarbrucken. He has also worked at the National Public Health Institution in Helsinki, as well as consultant in industry. His research interests include data mining, machine learning, database design, and text databases. He is the coauthor of the book "Design of Relational Databases" (Addison-Wesley) as well as numerous articles in algorithms, databases, machine learning and data mining. He is one of the editors-in-chief of the new scientifc journal "Data Mining and Knowledge Discovery".



16:00 and 20:00 Conference buses depart from Athens airport to Delphi
19:00 - 23:00 Registration
20:00 - 22:00 Reception (with light dinner)


9:00 - 10:00 Invited talk by J. Ullman (Stanford Univ.) - Information Integration Using Logical Views
10:00 - 10:30 Coffee break
10:30 - 12:30 Session 1: Conjunctive Queries in Heterogeneous Databases
  • Conjunctive query containment revisited
    -- C. Chekuri (Stanford Univ.), A. Rajaraman (Stanford Univ.)
  • Semantics and containment with internal and external conjunctions
    -- G. Grahne (Univ. Helsinki), N. Spyratos (LRI, Orsay), D. Stamate (LRI, Orsay)
  • Efficient complete tests for conjunctive query constraints with negation
    -- N. Huyn (Stanford Univ.)
  • Selection of views to materialize in a data warehouse
    -- H. Gupta (Stanford Univ.)
12:30 - 14:30 Lunch
14:30 - 16:00 Session 2: Logic and Databases I
  • Total and partial well-founded Datalog coincide
    -- J. Flum (Univ. Freiburg), M. Kubierschky (Univ. Freiburg), B. Ludaescher (Univ. Freiburg)
  • Fine hierarchies of generic computation
    -- J. Tyszkiewicz (RWTH Aachen)
  • Local properties of query languages
    -- G. Dong (Univ. Melbourne) , L. Libkin (Bell Labs), L. Wong (I.S.S., Singapore)
16:00 - 16:30 Coffee break
16:30 - 18:30 Session 3: Active Databases
  • Expressiveness and complexity of active databases
    -- P. Picouet (E.N.S.T.), V. Vianu (UC San Diego)
  • A model theoretic approach to update rule programs
    -- N. Bidoit (Univ. Paris XIII), S. Maabout (Univ. Paris XIII)
  • Abstract interpretation of active rules and its use in termination analysis
    -- J. Bailey (Univ. Melbourne), L. Crnogorac (Univ. Melbourne), K. Ramamohanarao (Univ. Melbourne), H. Sondergaard (Univ. Melbourne)
  • Structural issues in active rule systems
    -- J. Bailey (Univ. Melbourne), G. Dong (Univ. Melbourne), K. Ramamohanarao (Univ. Melbourne)
19:00 - 20:00 Business Meeting


8:30 - 10:00 Invited tutorial by H. Mannila (Univ. Helsinki) - Methods of data mining
10:00 - 10:30 Coffee break
10:30 - 12:30 Session 4: New Applications
  • Discovering all most specific sentences by randomized algorithms
    -- D. Gunopoulos (MPI), H. Mannila (Univ. Helsinki), S. Saluja (MPI)
  • A formal foundation for distributed workflow execution based on state charts
    -- D. Wodtke (Univ. Saarland), G. Weikum (Univ. Saarland)
  • Incorporating user preferences in multimedia queries
    -- R. Fagin (IBM Almaden), E.L. Wimmers (IBM Almaden)
  • Queries and computation on the web
    -- S. Abiteboul (INRIA and Stanford Univ.), V. Vianu (UC San Diego)
12:30 - 14:00 Lunch
14:00 - 16:30 Tour of the Delphi archaeological site and museum
16:30 - 17:00 Coffee break
17:00 - 18:00 Session 5: Logic and Databases II
  • The complexity of iterated belief revision
    -- P. Liberatore (Univ. Roma "La Sapienza")
  • Expressive power of unary counters
    -- M. Benedikt (Bell Labs), H.J. Keisler (Univ. Wisconsin)
18:00 - 19:00 Session 6: Concurrency Control
  • Concurrency control theory for deferred materialized views
    -- A. Kawaguchi (Columbia Univ.), D. Lieuwen (Bell Labs), I. Mumick (Bell Labs), D. Quass (Stanford Univ), K. Ross (Columbia Univ.)
  • Serializability of nested transactions in multidatabases
    -- U. Halici (METU, Ankara), B. Arpinar (METU, Ankara), A. Dogac (METU, Ankara)
20:30 Conference Banquet


9:00 - 10:00 Invited talk by S. Abiteboul (INRIA and Stanford Univ.) - Querying Semi-Structured Data
10:00 - 10:30 Coffee break
10:30 - 11:30 Session 7: Unstructured Data
  • Adding structure to unstructured data
    -- P. Buneman (Univ. Pennsylvania), S.Davidson (Univ. Pennsylvania), M. Fernandez (AT&T Research), D. Suciu (AT&T Research)
  • Correspondence and translation for heterogeneous data
    -- S. Abiteboul (INRIA and Stanford Univ.), S. Cluet (INRIA), T. Milo (Univ. Tel Aviv)
11:30 - 12:30 Session 8: Object Oriented Databases
  • Type consistency problems for queries in object-oriented databases
    -- Y. Ishihara (Nara Institute), H. Seki (Nara Institute), M. Ito (Nara Institute)
  • Object-oriented database evolution
    -- J.-B. Lagorce (LRI, Orsay), A. Stockus (LRI, Orsay), E. Waller (LRI, Orsay)
12:30 - 14:30 Lunch
14:30 - 16:00 Session 9: Access Methods
  • Performance of nearest neighbor queries in R-trees
    -- A. Papadopoulos (Aristotle Univ. of Thessaloniki), Y. Manolopoulos (Aristotle Univ. of Thessaloniki)
  • Optimal allocation of two-dimensional data
    -- K. Abdel-Ghaffar (UC Davis), A. El Abbadi (UC Santa Barbara)
  • Efficient indexing for constraint and temporal databases
    -- S. Ramaswamy (Lucent Technologies, Bell Labs Innovations)
16:00 - 16:30 Coffee break
16:30 - 18:00 Session 10: Spatial Data and Bulk Data
  • On topological elementary equivalence of spatial databases
    -- B. Kuijpers (Univ. Antwerp), J. Paredaens (Univ. Antwerp), J. Van den Bussche (Univ. Antwerp)
  • Dynamic constraint databases for spatial data
    -- P.Z. Revesz (Univ. Nebraska)
  • Tractable iteration mechanisms for bag languages
    -- L. Colby (Bell Labs), L. Libkin (Bell Labs)
18:30 - 19:30 Dinner (at the conference center)
20:00 Conference buses depart for Athens


Program co-chairs: Foto Afrati (NTUA Athens)
Phokion G. Kolaitis (UC Santa Cruz)

Program committee members:

    F. Afrati (Greece)      M. Cadoli (Italy)              S. Chaudhuri (USA)
    S. Cluet (France)       T. Eiter (Austria)             C. Faloutsos (USA)
    S. Greco (Italy)        M. Gyssens (Belgium)           O.H.G.Katona(Hungary)  
    P. Kolaitis (USA)       G. Kuper (Germany)             T. Milo (Israel)  
    M. Ozsoyoglu (USA)      J. Pokorny (Czech Rep.)        V. Sazonov (Russia)    
    H-J. Schek (Switzeland) E. Soisalon-Soininen (Finland) J. Su (USA)  
    V. Tannen (USA)         D. Van Gucht (USA)             V. Vianu (USA)  
    G. Vossen (Germany)     P. Wolper (Belgium)            J. Zlatuska (Czech Rep.)

Organizing committee co-chairs: Foto Afrati, Theodora Varvarigou (NTUA Athens)

Organizing committee members: Izambo Karali (Univ. Athens), Theodore Kavalieros, Theodore Mitakos, Costas Petropulos, Francesca Toni (NTUA Athens)


For further information, contact


Early Registration 12 November 1996
Hotel Reservation 12 November 1996



ICDT 97 will be held at the European Cultural Center of Delphi, Greece. Delphi (elevation 573 m.) is located in a magnificent natural setting about 170 km N/W of Athens on the undercliffs of Mount Parnassus. The drive from Athens to Delphi takes about three hours.

Delphi hosts one of the most significant archaeological sites in Greece. Although today it is just a small village, historically Delphi has been one of the cornerstones of ancient Greek civilization. Indeed, in antiquity Delphi was the seat of the oracle of Apollo, which was particularly active during the 7th and the 6th centuries BC and had to be consulted for essentially every major political decision. Ancient Greeks considered Delphi to be the "navel of the world". The shrine was administered by a panhellenic confederation, which every four years organized the Pythian Games; these were second only to the Olympic Games, but with more prominence on music and drama, as they were dedicated to Apollo.


January is winter time in Greece. The temperature at Delphi in January typically ranges from 5 to 15 degrees C (41-59 degrees F), with a small probability of being lower than 5 degrees C (41 degrees F).


The Greek currency is the drachma (DR). In September 1996, 1 US Dollar was approximately 235 DR. Currencey can be exchanged either at the Athens airport or in Delphi.


Greece uses +2 hour GMT (Greenwich Mean Time).


Delphi's archeological site has many interesting monuments and temples, including the sanctuary of Apollo, the theatre where the Delphic festivals were held, the stadium, the Kastalia Fountain where the Pythia, priestess of Apollo, would bathe before uttering her oracular utterances, and the tholos or rotunda, one of the most remarkable architectural constructions of antiquity (depicted on the conference poster). The collection of the Delphi museum consists exclusively of objects found on the archaeological site, including the famous bronze statue of the charioteer and an ancient copy of the sacred stone "omphalos" (the "navel of the world").

In Delphi and the surrounding villages you can find tavernas, restaurants, coffee houses, and bars.

From Delphi you can visit the ski facilities of Mount Parnassus (elevation 2400 m), the town of Itea (17 km), a pleasant summer resort by the sea, the town of Amfissa (22 km), surrounded by a forest of olive trees, and the monastery of Hosios Loukas (36 km), an outstanding example of Byzantine art and architecture.


The conference proceedings will appear as a volume in the "Lecture Notes in Computer Science" (LNCS) series, published by Springer-Verlag, and will be available at the conference. Each registered participant will receive a copy of the proceedings (except for students).



People wishing to attend the conference should fill out a copy of the registration form attached to the end of this announcement and return it, via e-mail, fax, or postal mail, to the address:

Foto, Afrati, ICDT 97
P.O. Box 64042 Email:
15710 Zographou, Athens tel: +30-1-7722498
GREECE fax: +30-1-7722499

E-mail registration is strongly preferred.
In addition to sending the registration form, the proper registration fee should be paid via cheque or bank transfer, as explained below in the METHOD OF PAYMENT section.

On-site registration will be available at the conference office during ICDT 97 starting Tuesday, January 7, 19:00.


Before 12 November 1996 After 12 November 1996
Member* US$ 430 US$ 500
Regular US$ 500 US$ 550
Student US$ 270 US$ 300
* For members of ACM and IEEE.

A separate form must be completed by each participant. Please make sure that your society affiliation (membership number) and/or university affiliation are shown on your registration form, or that proof of your full time student status comes together with it. Otherwise, the reduced registration fee will not be applied.

It is suggested to register for the conference at your earliest convenience. As soon as both registration form and fee have been received, an e-mail confirmation will be sent. To qualify for the early registration fee, payment must be received by November 12, 1996.

The conference fee includes admission to all sessions of the conference (including the invited talks and tutorial), a copy of the proceedings (not included in the student fee), refreshments during the breaks, lunches, transportation from and to Athens via the transfer buses of the conference, and the social events (reception on January 7, tour of the archaeological site and conference banquet on January 9 the latter not included in the student fee).


A limited number of free participations for people from Eastern Europe (free conference attendance and accomodation) will be offered. To become eligible for the support, please apply to Foto Afrati by e-mail ( before November 12, 1996.


Cancellation must be made in written form to the organizers. If cancellation notification is received before December 11, 1996, 80% of the registration fee will be refunded; no refunds will be made thereafter. For registered participants who cannot attend, the proceedings will be mailed after the conference.


Payment of the registration fees should be made in US dollars in one of the following ways:
  • cheque payable to "ICDT 97", mailed with the registration form,
  • bank transfer to ERGOBANK S.A., Zographou Branch
    Acc. No: 088/03741-00010/19
    SWIFT address: ERGOGRAA, 90 Papagou av. and Maratou, 15772 Athens, Greece
    Fax: +30-1-7486824
    Tel: +30-1-7486822

    If using a bank transfer, please send a copy of the receipt via postal mail or fax to the address used for the registration above. It is allowed to send a single check or make a single bank transfer covering more than one registration fee.

  • Upon arrival at the secretariat desk (full fee has to be paid).


TUESDAY, JANUARY 7, 1997 - 20:00 AND 22:00

Welcome reception with light dinner at the EUROPEAN CULTURAL CENTER OF DELPHI.

THURSDAY, JANUARY 9,1997 - 14:00 - 16:30

Tour of Delphi archeological site and museum.

THURSDAY, JANUARY 9,1997 - 20:30

Conference Banquet.*
During the banquet, a performance of Greek music will take place.

* The cost of a banquet ticket (for those not registered or students) is US $50 per person.



No entry visa is required for visitors from EEC countries, USA, and Canada. For other countries, information about visa can be obtained from the Greek Consulates or airlines.


Upon request, the secretariat of the conference will send a personal invitation for participation in the conference. It should be understood that such an invitation is only to help participants obtain a visa and does not constitute a commitment on the part of the organizers to provide any financial suport.



By plane: Athens International Airport has two terminals. OLYMPIC AIRWAYS passengers arrive at the Western Terminal. Passengers of all other airlines arrive at the Eastern Terminal.

You can travel from Athens to Delphi and from Delphi to Athens using the conference buses or public transportation as described below. For those who want to stay overnight in Athens before or after the conference, a block of rooms in the Chandris hotel (address: Sygrou 385, tel: +30-1-9414824) has been reserved. Conference buses will pick up participants both from the airport and the Chandris Hotel (see below).

To reach the Chandris Hotel take a taxi from the airport (approximatively 8 US$).


USING THE CONFERENCE BUSES (trip takes about three hours)

  • There are two conference buses on Tuesday, January 7, from Athens to Delphi:
    the first bus departs: at 16:00 from the airport (arrivals) and at 16:30 from the Chandris Hotel
    the second bus departs: at 20:00 from the airport (arrivals) and at 20:30 from the Chandris Hotel
  • There is a conference bus on Friday, January 10, from Delphi to Athens, departing at 20:00 (and stopping both at the Chandris Hotel and at the airport).
Conference bus transportation is included in the registration fee.


Public buses from ATHENS TO DELPHI depart from the Central Bus Station located at Liossion St, according to the following schedule.

Athens@Liossion St Delphi
7:30 10:30
10:30 13:30
14:30 17:30
17:30 20:30

Delphi Athens@Liossion St
5:30 8:30
9:00 12:00
10:30 13:30
13:30 18:00
16:00 19:00(Fri&Sun only)
18:00 21:00

The bus fare is DR 2600 one-way.

To reach the Central Bus Station at Liossion St, either take a taxi from the airport (approximatively 15 US$) or first take the bus number 091 from the airport to Syntagma Square (160 DR) and then a taxi from there to the Central Bus Station at Liossion St. (approximatively 10 US$). It is recommended to take a taxi directly from the airport.

Once in Delphi, all hotels are within easy walking distance.



Reservations have to be made directly with the person in charge at the address below.

A block of rooms has been reserved at the European Cultural Center of Delphi, as well as in a number of small and cozy hotels in the village of Delphi. Rooms are also reserved in the Chandris hotel in Athens for those who stay in Athens before or after the conference.

The special rates that were arranged are as follows: (in US $)


All rates are per room and night and include breakfast, taxes, and services.


Those wishing to book accommodation in Athens, Delphi and conference bus transportation Athens-Delphi-Athens are requested to complete the attached Accommodation Form and send before NOVEMBER 12 to:

M. Bessieri (for ICDT 97)
24 Voulis str.,
10562 Athens,
fax: +30 1 3221023

TOGETHER with payment in one of the two following ways (payment should be made in US dollars):

  • a cheque payable to M. BESSIERI, or
  • bank transfer to ERGOBANK S.A, Voulis Branch ,
    Acc. No: 75/02148-01251/58, c/o M. BESSIERI
    SWIFT Address: ERGOGRAA, 3 Kolokotroni str. 10562 Athens-Greece
    Fax:+301-3222 264
It is allowed to send a single cheque or make a single bank transfer covering more than one person (also covering more than one room).

A confirmation will be send to each participant with details for the hotel. The reservation will be confirmed only upon receipt of the payment.

Cancellation must be made in written form to the organizers. If cancellation notification is received before December 11, 1996, 80% of the accommodation fee will be refunded; no refunds will be made thereafter.



[Please type or print. ONE FORM PER PERSON]

    Name ___________________________________First Name______________________
    Affiliation ____________________________________________________________
    Street Address _________________________________________________________
    City, State, Postal Code _______________________________________________
    Country ________________________________________________________________
    Phone(s) _______________________________________________________________
    Fax ____________________________________________________________________
    E-mail _________________________________________________________________
    Dietary Restrictions (circle if applicable):    Vegetarian     
                      Before 12 November 1996    After  12 November 1996
                      -----------------------    -----------------------
    Member*           US$430                       US$500
    Regular           US$500                       US$550
    Student#          US$270                       US$300
    Accompanying      US$300                       US$350

The fee for accompanying persons covers meals and all the special events of
the conference.
* For members of ACM and IEEE. Please quote the membership number.
# If you apply for the student fee, please attach a copy of your student identification for the ongoing year or a letter signed by the head of your department confirming that you are a student. Total Cost US$:____________ Number of extra Banquet tickets______ (US$50.00 per person) Total Cost US$:____________ Total Due US$: ______________________________ Payment: please send either * cheque payable to "ICDT 97", mailed with the registration form, (do not forget to sign and write your name(s) on the back of the check) or * bank transfer to ERGOBANK S.A., Zographou Branch Acc. No: 088/03741-00010/19 SWIFT address: ERGOGRAA, 90 Papagou av, and Maratou, 15772 Athens, Greece Fax: +30-1-7486824 Tel: +30-1-7486822 (do not forget to write your name(s) and refer to ICDT 97)


[Please type or print. ONE FORM PER REGISTERED PERSON]

    Name __________________________________First Name________________________
    Affiliation _____________________________________________________________
    Street Address __________________________________________________________
    City, State, Postal Code ________________________________________________
    Country _________________________________________________________________
    Phone(s) ________________________________________________________________
    Fax _____________________________________________________________________
    E-mail _________________________________________________________________
    Arrival Date______________________Airline/No. Flight____________________
    Arrival Time____________________________________________________________
    Departure Date____________________Airline/No. Flight____________________
    Departure Time__________________________________________________________

    [Prices are per room per night. Please write the required number of
    rooms in the appropriate cells]


CHANDRIS HOTEL: US$ 117 (single) US$ 147 (double)
single [ ] double [ ]
   name of other occupant:_____________________

   Before the conference
   FROM _________(date of arrival) TO __________________(date of departure)
   After the conference
   FROM _________(date of arrival) TO __________________(date of departure) 

   Total cost US $________________


HOTEL I US$85 US$102
single [ ] [ ] [ ]
double [ ] [ ] [ ]
    name of other occupant:_____________________
    FROM _________(date of arrival) to __________________(date of departure)
    Total cost US $________________
                                              Total due US $________________


Write on the appropriate cells the required number of seats:
from airport from Chandris
first bus on January 7 (16:00 hours) (16:30 hours)
second bus on January 7 (20:00 hours) (20:30 hours)

bus on January 10

Payment: please enclose either

* a cheque payable to M. BESSIERI or (do not forget to sign, write your name and refer to ICDT'97 on the back of the check) or

* bank transfer to ERGOBANK S.A, Voulis Branch ,
Acc. No: 75/02148-01251/58, c/o M. BESSIERI
SWIFT Address: ERGOGRAA, 3 Kolokotroni str. 10562 Athens-Greece
Fax:+301-3222 264
(do not forget to write your name and refer to ICDT'97)

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