<s>
The	O
GELLO	B-Language
Expression	I-Language
Language	I-Language
was	O
started	O
in	O
2001	O
and	O
introduced	O
in	O
2002	O
;	O
in	O
2005	O
,	O
GELLO	O
was	O
adopted	O
as	O
an	O
international	O
standard	O
by	O
Health	O
Level	O
Seven	O
International	O
and	O
ANSI	O
for	O
a	O
decision	B-Application
support	I-Application
language	O
.	O
</s>
<s>
GELLO	O
is	O
a	O
class-based	O
object-oriented	B-Language
programming	I-Language
language	I-Language
and	O
a	O
relative	O
of	O
the	O
Object	B-Language
Constraint	I-Language
Language	I-Language
(	O
OCL	O
)	O
.	O
</s>
<s>
The	O
intention	O
was	O
for	O
GELLO	O
to	O
evolve	O
as	O
a	O
standard	O
query	O
and	O
expression	O
language	O
for	O
decision	B-Application
support	I-Application
.	O
</s>
<s>
GELLO	O
creates	O
the	O
potential	O
for	O
many	O
decision	B-Application
support	I-Application
options	O
,	O
as	O
the	O
full	O
array	O
of	O
atomic	O
patient	O
data	O
is	O
greatly	O
accessible	O
to	O
complement	O
better	O
,	O
safer	O
clinical	O
decision-making	O
by	O
health	O
professionals	O
.	O
</s>
<s>
Furthermore	O
,	O
this	O
enables	O
specialist	O
clinicians	O
to	O
customize	O
their	O
current	O
systems	O
and	O
create	O
flexible	O
purpose	O
built	O
decision	B-Application
support	I-Application
systems	I-Application
.	O
</s>
<s>
These	O
criteria	O
can	O
be	O
used	O
in	O
decision-support	B-Application
knowledge	O
bases	O
such	O
as	O
those	O
designed	O
to	O
provide	O
alerts	O
and	O
reminders	O
,	O
guidelines	O
,	O
or	O
other	O
decision	O
rules	O
.	O
</s>
