<s>
Push	B-General_Concept
Access	I-General_Concept
Protocol	I-General_Concept
(	O
or	O
PAP	O
)	O
is	O
a	O
protocol	O
defined	O
in	O
WAP-164	O
of	O
the	O
Wireless	B-Protocol
Application	I-Protocol
Protocol	I-Protocol
(	O
WAP	O
)	O
suite	O
from	O
the	O
Open	O
Mobile	O
Alliance	O
.	O
</s>
<s>
PAP	O
is	O
used	O
for	O
communicating	O
with	O
the	O
Push	B-General_Concept
Proxy	I-General_Concept
Gateway	I-General_Concept
,	O
which	O
is	O
usually	O
part	O
of	O
a	O
WAP	O
Gateway	O
.	O
</s>
<s>
PAP	O
is	O
intended	O
for	O
use	O
in	O
delivering	O
content	O
from	O
Push	O
Initiators	O
to	O
Push	B-General_Concept
Proxy	I-General_Concept
Gateways	I-General_Concept
for	O
subsequent	O
delivery	O
to	O
narrow	O
band	O
devices	O
,	O
including	O
mobile	O
phones	O
and	O
pagers	B-Application
.	O
</s>
<s>
The	O
Push	B-General_Concept
Access	I-General_Concept
Protocol	I-General_Concept
is	O
not	O
intended	O
for	O
use	O
over	O
the	O
air	O
.	O
</s>
<s>
PAP	O
specifies	O
the	O
following	O
possible	O
operations	O
between	O
the	O
Push	O
Initiator	O
and	O
the	O
Push	B-General_Concept
Proxy	I-General_Concept
Gateway	I-General_Concept
:	O
</s>
<s>
The	O
interaction	O
between	O
the	O
Push	O
Initiators	O
and	O
the	O
Push	B-General_Concept
Proxy	I-General_Concept
Gateways	I-General_Concept
is	O
in	O
the	O
form	O
of	O
XML	B-Protocol
messages	O
.	O
</s>
<s>
The	O
purpose	O
of	O
the	O
Push	O
Submission	O
is	O
to	O
deliver	O
a	O
Push	B-General_Concept
message	I-General_Concept
from	O
a	O
Push	O
Initiator	O
to	O
a	O
PPG	O
,	O
which	O
should	O
then	O
deliver	O
the	O
message	O
to	O
a	O
user	O
agent	O
in	O
a	O
device	O
on	O
the	O
wireless	O
network	O
.	O
</s>
<s>
The	O
Push	B-General_Concept
message	I-General_Concept
contains	O
a	O
control	O
entity	O
and	O
a	O
content	O
entity	O
,	O
and	O
MAY	O
contain	O
a	O
capabilities	O
entity	O
.	O
</s>
<s>
The	O
control	O
entity	O
is	O
an	O
XML	B-Protocol
document	I-Protocol
that	O
contains	O
control	O
information	O
(	O
push-message	O
)	O
for	O
the	O
PPG	O
to	O
use	O
in	O
processing	O
the	O
message	O
for	O
delivery	O
.	O
</s>
<s>
The	O
response	O
to	O
the	O
push	O
request	O
is	O
an	O
XML	B-Protocol
document	I-Protocol
(	O
push-response	O
,	O
section	O
9.3	O
)	O
that	O
indicates	O
initial	O
acceptance	O
or	O
failure	O
.	O
</s>
<s>
At	O
minimum	O
the	O
PPG	O
MUST	O
validate	O
against	O
the	O
DTD	O
 [ XML ] 	O
the	O
control	O
entity	O
in	O
the	O
message	O
and	O
report	O
the	O
result	O
in	O
the	O
response	O
.	O
</s>
<s>
There	O
are	O
provisions	O
in	O
the	O
Push	B-General_Concept
message	I-General_Concept
to	O
specify	O
multiple	O
recipients	O
.	O
</s>
<s>
The	O
response	O
message	O
corresponds	O
to	O
the	O
submit	O
message	O
,	O
so	O
there	O
is	O
one	O
response	O
message	O
for	O
one	O
push	B-General_Concept
message	I-General_Concept
,	O
regardless	O
of	O
the	O
number	O
of	O
addresses	O
specified	O
.	O
</s>
<s>
The	O
purpose	O
of	O
the	O
Push	O
Cancellation	O
is	O
to	O
allow	O
the	O
Push	O
Initiator	O
to	O
attempt	O
to	O
cancel	O
a	O
previously	O
submitted	O
push	B-General_Concept
message	I-General_Concept
.	O
</s>
<s>
There	O
are	O
three	O
addresses	O
to	O
be	O
considered	O
by	O
the	O
Push	O
Initiator	O
:	O
the	O
push	B-General_Concept
proxy	I-General_Concept
gateway	I-General_Concept
address	O
,	O
the	O
wireless	O
device	O
address	O
,	O
and	O
the	O
result	O
notification	O
address	O
.	O
</s>
<s>
The	O
push	B-General_Concept
proxy	I-General_Concept
gateway	I-General_Concept
address	O
must	O
be	O
known	O
by	O
the	O
Push	O
Initiator	O
.	O
</s>
<s>
This	O
address	O
is	O
needed	O
at	O
the	O
layer	O
below	O
the	O
push	B-General_Concept
access	I-General_Concept
protocol	I-General_Concept
.	O
</s>
<s>
The	O
push	B-General_Concept
proxy	I-General_Concept
gateway	I-General_Concept
is	O
addressed	O
using	O
a	O
unique	O
address	O
that	O
depends	O
on	O
the	O
underlying	O
protocol	O
.	O
</s>
<s>
The	O
device	O
addressing	O
information	O
is	O
included	O
as	O
part	O
of	O
the	O
message	O
content	O
(	O
XML	B-Protocol
tagged	O
content	O
)	O
.	O
</s>
<s>
In	O
addition	O
,	O
a	O
“	O
notify-requested-to	O
”	O
address	O
may	O
be	O
provided	O
by	O
the	O
Push	O
Initiator	O
when	O
required	O
so	O
that	O
the	O
push	B-General_Concept
proxy	I-General_Concept
gateway	I-General_Concept
can	O
later	O
respond	O
to	O
the	O
Push	O
Initiator	O
with	O
result	O
notification	O
.	O
</s>
<s>
Rather	O
than	O
submitting	O
multiple	O
identical	O
push	B-General_Concept
messages	I-General_Concept
,	O
one	O
to	O
each	O
recipient	O
,	O
the	O
Push	O
Initiator	O
may	O
submit	O
a	O
single	O
push	B-General_Concept
message	I-General_Concept
addressed	O
to	O
multiple	O
recipients	O
.	O
</s>
<s>
The	O
push	B-General_Concept
access	I-General_Concept
protocol	I-General_Concept
is	O
independent	O
of	O
the	O
transport	O
used	O
.	O
</s>
<s>
message	O
is	O
a	O
simple	O
application/xml	O
entity	O
.	O
</s>
<s>
In	O
the	O
multipart	O
messages	O
,	O
the	O
first	O
entity	O
contains	O
all	O
push	O
related	O
control	O
information	O
in	O
an	O
XML	B-Protocol
document	I-Protocol
,	O
the	O
second	O
entity	O
contains	O
the	O
content	O
for	O
the	O
wireless	O
device	O
,	O
the	O
third	O
entity	O
,	O
if	O
present	O
,	O
contains	O
UAPROF	O
client	O
capabilities	O
.	O
</s>
<s>
The	O
control	O
entity	O
is	O
a	O
MIME	O
body	O
part	O
which	O
holds	O
an	O
XML	B-Protocol
document	I-Protocol
containing	O
one	O
pap	O
element	O
as	O
defined	O
in	O
section	O
9.1	O
.	O
</s>
