<s>
The	O
Standard	O
Interface	O
for	O
Real-time	B-General_Concept
Information	O
or	O
SIRI	O
is	O
an	O
XML	B-Protocol
protocol	O
to	O
allow	O
distributed	O
computers	O
to	O
exchange	O
real-time	B-General_Concept
information	O
about	O
public	O
transport	O
services	O
and	O
vehicles	O
.	O
</s>
<s>
SIRI	O
is	O
based	O
on	O
the	O
CEN	O
Transmodel	O
abstract	O
model	O
for	O
public	O
transport	O
information	O
,	O
and	O
comprises	O
a	O
general	O
purpose	O
model	O
,	O
and	O
an	O
XML	B-Protocol
schema	O
for	O
public	O
transport	O
information	O
.	O
</s>
<s>
CEN	O
SIRI	O
allows	O
pairs	O
of	O
server	O
computers	O
to	O
exchange	O
structured	O
real-time	B-General_Concept
information	O
about	O
schedules	O
,	O
vehicles	O
,	O
and	O
connections	O
,	O
together	O
with	O
informational	O
messages	O
related	O
to	O
the	O
operation	O
of	O
the	O
services	O
.	O
</s>
<s>
To	O
provide	O
real-time	B-General_Concept
departure	O
from	O
stop	O
information	O
for	O
display	O
on	O
stops	O
,	O
internet	O
and	O
mobile	O
delivery	O
systems	O
;	O
</s>
<s>
To	O
provide	O
real-time	B-General_Concept
progress	O
information	O
about	O
individual	O
vehicles	O
;	O
</s>
<s>
To	O
exchange	O
planned	O
and	O
real-time	B-General_Concept
timetable	O
updates	O
;	O
</s>
<s>
SIRI-ET	O
:	O
Estimated	O
Timetable	O
service	O
:	O
Allows	O
the	O
exchange	O
of	O
the	O
real-time	B-General_Concept
timetable	O
for	O
a	O
public	O
transport	O
service	O
along	O
a	O
route	O
.	O
</s>
<s>
SIRI-SM	O
:	O
Stop	O
Monitoring	O
service	O
:	O
Allows	O
the	O
exchange	O
of	O
the	O
real-time	B-General_Concept
arrivals	O
and	O
departures	O
at	O
a	O
stop	O
of	O
public	O
transport	O
services	O
.	O
</s>
<s>
SIRI-VM	O
:	O
Vehicle	O
Monitoring	O
service	O
:	O
Allows	O
the	O
exchange	O
of	O
the	O
real-time	B-General_Concept
positions	O
of	O
public	O
transport	O
vehicles	O
.	O
</s>
<s>
SIRI-CM	O
:	O
Connection	O
Monitoring	O
service	O
:	O
Allows	O
the	O
exchange	O
of	O
the	O
real-time	B-General_Concept
connections	O
of	O
public	O
transport	O
services	O
at	O
a	O
stop	O
,	O
taking	O
into	O
account	O
delays	O
.	O
</s>
<s>
SIRI-FM	O
:	O
Facility	O
Monitoring	O
service	O
:	O
Allows	O
the	O
exchange	O
of	O
the	O
real-time	B-General_Concept
status	O
of	O
facilities	O
at	O
a	O
stop	O
such	O
as	O
lifts	O
,	O
escalators	O
,	O
etc	O
.	O
</s>
<s>
The	O
CEN	O
SIRI	O
standard	O
was	O
developed	O
from	O
European	O
national	O
standards	O
for	O
real-time	B-General_Concept
data	O
exchange	O
,	O
in	O
particular	O
the	O
German	O
VDV	O
453	O
standard	O
,	O
between	O
2000	O
and	O
2005	O
,	O
and	O
included	O
eight	O
functional	O
services	O
.	O
</s>
<s>
An	O
important	O
new	O
addition	O
in	O
SIRI	O
v2.0	O
was	O
the	O
description	O
of	O
a	O
uniform	O
transform	O
for	O
rendering	O
CEN-SIRI	O
messages	O
into	O
a	O
flat	O
format	O
that	O
can	O
be	O
used	O
in	O
simple	O
http	O
requests	O
without	O
an	O
XML	B-Protocol
rendering	O
.	O
</s>
<s>
Västtrafik	O
,	O
PTA	O
for	O
western	O
Sweden	O
,	O
uses	O
SIRI	O
ET	O
and	O
SX	O
for	O
real-time	B-General_Concept
information	O
in	O
the	O
travel	B-Application
planner	I-Application
:	O
</s>
