<s>
A	O
process	B-Application
driven	I-Application
messaging	I-Application
service	I-Application
(	O
PDMS	O
)	O
is	O
a	O
service	O
that	O
is	O
process	O
oriented	O
and	O
exchanges	O
messages/data	O
calls	O
.	O
</s>
<s>
A	O
PDMS	O
is	O
a	O
service	O
where	O
jobs	O
and	O
triggers	O
can	O
be	O
put	O
together	O
to	O
create	O
a	O
workflow	B-Operating_System
for	O
a	O
message	O
.	O
</s>
<s>
Messaging	B-Protocol
platforms	I-Protocol
are	O
considered	O
key	B-Architecture
Internet	I-Architecture
infrastructure	I-Architecture
elements	I-Architecture
.	O
</s>
<s>
A	O
process	B-Application
driven	I-Application
messaging	I-Application
service	I-Application
is	O
a	O
service	O
where	O
jobs	O
and	O
triggers	O
can	O
be	O
put	O
together	O
to	O
create	O
a	O
workflow	B-Operating_System
for	O
a	O
message	O
and	O
the	O
workflow	B-Operating_System
can	O
be	O
seen	O
as	O
a	O
process	O
.	O
</s>
<s>
A	O
workflow	B-Operating_System
is	O
executed	O
when	O
a	O
trigger	O
is	O
prompted	O
.	O
</s>
<s>
The	O
workflow	B-Operating_System
will	O
still	O
be	O
active	O
even	O
when	O
all	O
jobs	O
have	O
been	O
executed	O
,	O
but	O
nothing	O
occurs	O
until	O
it	O
is	O
re-triggered	O
.	O
</s>
<s>
A	O
workflow	B-Operating_System
in	O
PDMS	O
is	O
used	O
to	O
wrap	O
triggers	O
and/or	O
jobs	O
together	O
to	O
accomplish	O
a	O
flow	O
of	O
actions	O
and	O
events	O
that	O
can	O
be	O
invoked	O
over	O
and	O
over	O
again	O
without	O
repeating	O
the	O
configuration	O
.	O
</s>
<s>
A	O
workflow	B-Operating_System
is	O
a	O
container	O
.	O
</s>
<s>
A	O
workflow	B-Operating_System
process	O
is	O
a	O
container	O
for	O
a	O
group	O
of	O
workflow	B-Operating_System
statuses	O
and	O
actions	O
,	O
such	O
as	O
moving	O
a	O
record	O
from	O
one	O
status	O
to	O
another	O
.	O
</s>
<s>
The	O
items	O
that	O
can	O
be	O
contained	O
in	O
the	O
workflow	B-Operating_System
are	O
then	O
available	O
to	O
all	O
triggers	O
and	O
jobs	O
within	O
the	O
workflow	B-Operating_System
.	O
</s>
<s>
The	O
concept	O
of	O
a	O
workflow	B-Operating_System
can	O
be	O
seen	O
as	O
a	O
template	O
for	O
either	O
part	O
of	O
,	O
or	O
a	O
whole	O
,	O
business	O
process	O
.	O
</s>
<s>
Workflows	B-Operating_System
can	O
be	O
triggered	O
for	O
a	O
number	O
of	O
different	O
reasons	O
,	O
an	O
example	O
of	O
which	O
could	O
be	O
if	O
something	O
were	O
to	O
happen	O
in	O
the	O
domain	O
or	O
there	O
were	O
to	O
be	O
an	O
explicit	O
call	O
to	O
invoke	O
.	O
</s>
<s>
The	O
workflow	B-Operating_System
will	O
be	O
in	O
a	O
state	O
awaiting	O
execution	O
when	O
the	O
workflow	B-Operating_System
,	O
its	O
triggers	O
,	O
and	O
its	O
jobs	O
are	O
active	O
.	O
</s>
<s>
When	O
created	O
,	O
workflows	B-Operating_System
require	O
the	O
last	O
job	O
to	O
be	O
added	O
first	O
,	O
meaning	O
jobs	O
are	O
to	O
be	O
listed	O
in	O
reverse	O
order	O
of	O
execution	O
.	O
</s>
<s>
A	O
trigger	O
—	O
what	O
starts/executes	O
a	O
workflow	B-Operating_System
—	O
prompts	O
the	O
execution	O
of	O
actions	O
.	O
</s>
<s>
For	O
example	O
,	O
when	O
a	O
trigger	O
executes	O
an	O
instance	O
of	O
a	O
workflow	B-Operating_System
.	O
</s>
<s>
A	O
process	B-Application
driven	I-Application
messaging	I-Application
service	I-Application
is	O
often	O
used	O
when	O
managing	O
a	O
more	O
or	O
less	O
complex	O
business	O
processes	O
.	O
</s>
<s>
PDMS	O
is	O
based	O
upon	O
Event-Driven	B-Application
Architecture	I-Application
whereas	O
the	O
architectural	O
pattern	O
may	O
be	O
applied	O
by	O
the	O
design	O
and	O
implementation	O
of	O
applications	O
and	O
systems	O
which	O
transmit	O
events	O
among	O
loosely	B-Application
coupled	I-Application
software	O
components	O
and	O
services	O
.	O
</s>
