jeve a suc- 
se develop- 
as national 
ve the ap- 
ll form the 
ojects will 
al network 
; heteroge- 
Computer, 
ration Sys- 
tive. WDL 
Distributed 
lesley, Co., 
Dis- 
s and Sys- 
se language 
1991. 
lon, D. G. 
um, and R. 
d multime- 
28(1):15 - 
)garra, W. 
underman. 
rence man- 
ratory, Oak 
1993. 
action pro- 
ques. Mor- 
California, 
yn Working 
ogaphic In- 
. Draft Re- 
esearch In- 
, Calfornia, 
[12] 
[13] 
SQL Access Group. Sql access formats 
and protocols (fap) specification. Specs. 
Standard, 1991. 
D. Heimbigner and D. McLeod. A feder- 
ated architecture for information manage- 
ment. ACM Trans. on Office Information 
Systems, 3(3):253 — 278, Jul. 1985. 
C. P. Kolovson, M.-A. Neimet, and S. 
Potaimianos. Interoperability os spatial 
and attribute data manager: a case study. 
In D. Abel and B. C. Ooi, editors, Ad- 
vances in Spatial Databases, pages 239 — 
263, Springer Verlag, Jun. 1993. 
W. Litwin, L. Mark, and N. Roussopou- 
los. Interoperability of multiple au- 
tonomous databases. ACM Comput. Sur- 
veys, 22(3):267 — 293, Sept. 1990. 
J. Medved and G. Petras. Client-server 
architecture of delta-x. In In this proceed- 
ings, Jun. 1994. 
H. Samet. The Design and Analysis of 
Spatial Data Structures. Addison-Wesley, 
Reading, Mass., 1990. 
H. J. Schek and A. Wolf. From extensi- 
ble databases to interoperability between 
multiple databases and gis applications. 
In D. Abel and B. C. Ooi, editors, Ad- 
vances in Spatial Databases, pages 207 — 
238, Springer Verlag, Jun. 1993. 
A. P. Sheth and J. A Larson.  Feder- 
ated database systems for managing dis- 
tributed heterogeneous, and autonomous 
databases. ACM Comput. Surveys, 
22(3):183 — 236, Sept. 1990. 
A. Sinha. Client-server computing. 
Comm. ACM Journal, 35(7):77 — 98, Jul. 
1992. 
M. Stonebraker, J. Frew, and J. Dozier. 
The sequoia 2000 project. In D. Abel and 
B. C. Ooi, editors, Advances in Spatial 
Databases, pages 397 — 412, Springer Ver- 
lag, Jun. 1993. 
Surveys and Resource Mapping Branch. 
SAIF: Spatial archive and interchange for- 
mat: Formal Definition. 
British Columbia, Aug. 1992. 
Province of 
511 
[21] 
À. U. Tansel, J. Clifford, S. Gadia, S. Joja- 
dia, À. Segiv, and R. Snodgrass. Temporal 
databases: Theory, design and implemen- 
tation. The Benjamin/Cummings Pub- 
lishing, Co., Inc., Redwood City, Caifor- 
nia, 1993. 
M. G. Williams. Implementing the spatial 
data transfer standard. Cartography and 
Geographic Information Systems: Ameri- 
can Congress on Surveying and Mapping, 
19(5), Dec. 1992.