45
P.A. Bernstein, S. Melnik: Meta Data Management,
ICDE'04 Boston
Change Propagation
xsd1
xsd2
rdb1
lGiven
Ømap1 between xsd1 and SQL schema rdb1
Øxsd2,
a modified version of xsd1
lProduce
Ørdb2
to store instances of xsd2
Øa
mapping between xsd2 and rdb2
Now we need to merge
Diff(xsd2,map4) into rdb3
Diff(xsd2,map4) into rdb3
map1
1. map2= Match(xsd1, xsd2)
2. map3 = map2 ·
map1
3.
<map4, rdb3 > = Copy(map3)
rdb3
3. map4
rdb2
map