The VLDB Journal (1996) A Database Model for Object Dynamics
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Person
Unemployed
Employee
Engineer
Principal−Engineer
Member−of−Board
Fred
t1
t2
t3
t4
hires
employed_by
owns
owned_by
is−a
is−ais−a
is−a
PRIVATE
CORPORA−
TION
GOVERN−
MENT
BRANCH
EMPLOYEE
MANAGER
EMPLOYER
COMPANY
OWNER
n
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is−a
is−a
is−ais−a
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{m1,m2,m3
c1}
{pc1,pc2}{pc1,pc2 gb1,gb2}{gb1,gb2}
{e1,e2,e3,
e4,e5,e6,
e7,e8,
e9,e10,
m1,m2,m3
c1}
{(pc1,e1),
(pc1,e5),
(pc1,e7)}
{(pc1,c1),
(pc2,c1)}
{c1}
EMPLOYEE
EMPLOYER
MANAGER
COMPANY
OWNER
PRIVATECORPORATIONGOVERNMENT
BRANCH
hires
employed_by
owns
owned_by
is−a
is−ais−a
is−a
is−aEXECUTIVEDIRECTOREDUCATEDEMPLOYEESHAREHOLDERENGINEERSHAREHOLDERENGINEER ACADEMICis−ais−ais−ais−ais−aAPPLICATION−#2APPLICATION−#1APPLICATION−#n{e1,e3,e5}{e1,e2,e7}{e3,e4}{e1}{e1,e2,e3,e4,e5,e6,e7,e8}{m3}{pc1,pc2 gb1,gb2}{m1,m2,m3 c1}{c1}{pc1,pc2}{gb1,gb2} CLASS DAG WITHOBJECT ROLES{e1,e2,e3,e4,e5,e6,e7,e8,e9,e10,m1,m2,m3c1}is−a
CLASS
DAG
...
......c.........
...
c
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...
ACADEMIC
PROFESSORSTUDENTASSISTANT
is−ais−ais−a
ACADEMIC
PROFESSORSTUDENTASSISTANT
is−ais−ais−a
TUTOR
is−a
ACADEMIC
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PROFESSORSTUDENTASSISTANTTUTOR
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is−a
is−ais−a
is−a
is−a
is−a
{i1, ..., in1}{j1, ... , jn2}{k1, ..., kn3}
k1, ..., kn3}j1, ... , jn2,{i1, ..., in1,
is−ais−a
PRIVATE
CORPORA−
TION
GOVERN−
MENT
BRANCH
EMPLOYER
contracted−to
(a)
PRIVATE
CORPORA−
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GOVERN−
MENT
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pc1
pc2
pc3
pcn
.
.
.
gb1
gb2
gb5
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pc1
pcn
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is−a
is−a
PRINCIPAL
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FOR
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CORPORATION_pc1
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EMPLOYEE
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CUSTOMER
STEADY
JOB
CUSTOMER
QUALIFIES
FOR
HOME−LOAN
QUALIFIES
FOR
CAR−LOAN
{e1,e2,e3
e4,e5,e6,e7}
{e1,e2,e7}
{e2,e4,e6}
{e1,e2,e3,
e4,e5,e6,
e7,e8,
e9,e10,
m1,m2,m3
c1}
{e1,e2,e3,e4
e5,e6,e7,e8}
EDUCATED
EMPLOYEE
SOCIAL
WORKER
ENGINEER
ACADEMIC
CASUAL
LECTURER
U
is−a
is−a
is−a
is−a
{e1,e2,e3,e4,
e5,e6,e7,e8}
{e1,e2,e7}
{e5}
{e6}
{e3,e4}
