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e
v
ar
io
u
s
in
f
o
r
m
atio
n
th
a
t
ar
e
u
s
u
ally
av
ail
ab
le
o
n
th
e
w
eb
ar
e
a
d
v
er
tis
em
en
t,
n
av
ig
ati
o
n
,
c
o
n
t
ac
t
in
f
o
r
m
atio
n
an
d
d
e
co
r
a
ti
o
n
.
T
h
e
m
is
ce
ll
an
e
o
u
s
in
f
o
r
m
atio
n
f
o
u
n
d
o
n
a
n
y
w
eb
p
ag
es
a
r
e
s
e
ld
o
m
r
el
ate
d
t
o
v
alu
a
b
l
e
in
f
o
r
m
atio
n
.
I
t
is
ca
lle
d
as
n
o
i
s
y
.
Fu
r
th
er
m
o
r
e,
e
ac
h
w
eb
p
a
g
e
h
as
m
u
ltip
le
to
p
i
cs
th
at
a
r
e
n
o
t
r
el
ate
d
t
o
e
ac
h
o
th
e
r
.
M
o
s
t
w
eb
a
p
p
lic
ati
o
n
s
d
ev
el
o
p
e
d
w
ith
r
e
ce
n
t
p
r
o
g
r
ess
in
c
o
m
p
u
tin
g
tech
n
o
l
o
g
ies
als
o
c
o
n
tain
m
u
ltim
ed
ia
d
at
a
s
u
ch
as
im
ag
es,
g
r
a
p
h
ics
an
d
au
d
i
o
h
av
e
in
cr
ea
s
e
d
o
v
e
r
th
e
p
ast
s
ev
e
r
al
y
ea
r
s
[
5
]
.
R
ec
en
tly
,
d
et
ec
tin
g
o
r
ex
tr
ac
t
in
g
ce
r
tain
in
f
o
r
m
atio
n
o
r
w
eb
p
ag
e
co
n
t
e
n
t b
ec
o
m
es u
s
er
p
r
i
o
r
ity
[
6
]
.
Mu
ltim
ed
ia
c
o
n
t
en
ts
s
h
o
u
ld
b
e
j
u
s
t
ea
s
y
t
o
r
e
tr
i
ev
e
d
an
d
ac
c
ess
e
d
as
al
p
h
an
u
m
er
ic
d
ata
b
y
u
s
er
.
Hu
m
an
p
er
ce
p
t
io
n
is
th
e
m
o
s
t
im
p
o
r
t
an
t
th
in
g
th
at
w
e
n
ee
d
to
c
o
n
s
id
er
to
m
ak
e
u
s
er
f
ee
l
co
m
f
o
r
t
ab
le
an
d
ea
s
y
to
u
s
e
a
s
o
f
tw
ar
e.
Ma
n
y
s
o
f
tw
ar
e
d
ev
e
lo
p
e
d
u
s
in
g
v
ar
i
o
u
s
tech
n
i
q
u
es
.
Do
cu
m
en
t
Ob
jec
t
Mo
d
el
o
r
k
n
o
w
n
as
DOM
is
a
tech
n
iq
u
e
th
at
ca
n
s
t
r
u
ctu
r
e
w
eb
p
ag
e
co
n
t
en
ts
in
to
d
et
ails
w
ith
ea
ch
h
t
m
l
tag
s
in
tr
e
e
s
t
r
u
ctu
r
e.
T
h
e
m
ajo
r
ity
w
eb
p
ag
es
a
r
e
w
r
itten
in
h
tm
l
co
m
p
a
r
e
t
o
x
m
l
f
o
r
m
at.
T
h
e
m
ain
o
b
j
e
ctiv
e
o
f
th
is
r
es
ea
r
ch
is
t
o
p
r
o
v
i
d
e
u
s
er
th
e
ea
s
e
o
f
u
n
d
e
r
s
t
an
d
in
g
to
s
tr
u
ctu
r
e
o
f
w
eb
p
ag
e
c
o
n
ten
ts
co
m
p
a
r
e
t
o
co
m
p
lic
at
ed
te
ch
n
iq
u
e
.
N
atu
r
al
ly
,
m
an
k
in
d
u
n
d
er
s
t
an
d
b
et
te
r
f
r
o
m
th
e
v
is
u
al
p
r
es
en
tati
o
n
th
an
tex
t
p
r
esen
t
ati
o
n
.
W
h
en
a
w
eb
p
a
g
e
is
p
r
es
en
te
d
t
o
u
s
er
,
v
is
u
al
v
ie
w
ca
n
h
elp
th
e
u
s
er
to
d
i
v
id
e
w
eb
p
ag
e
in
t
o
s
ev
er
al
p
ar
t.
I
n
p
r
ev
io
u
s
w
o
r
k
s
[
7
,
8
]
,
w
e
d
i
s
cu
s
s
ed
th
e
ex
p
e
r
im
en
tal
p
r
o
c
ess
o
f
im
ag
e
ex
t
r
a
cti
o
n
b
as
ed
o
n
DO
M
an
d
J
SON
.
T
h
e
p
e
r
f
o
r
m
an
ce
o
f
in
f
o
r
m
ati
o
n
ex
tr
ac
t
io
n
b
as
ed
o
n
p
r
ev
i
o
u
s
s
tu
d
y
s
h
o
w
s
DOM
is
f
aste
r
th
an
o
th
e
r
a
p
p
r
o
a
ch
es.
H
o
w
ev
er
,
D
OM
co
n
s
u
m
es
lar
g
e
am
o
u
n
t
o
f
m
e
m
o
r
y
w
h
en
th
e
h
t
m
l
s
tr
u
ctu
r
e
b
ec
o
m
es
lar
g
e
.
T
h
e
l
ar
g
e
u
s
ag
e
o
f
m
em
o
r
y
w
i
ll
af
f
ec
t
th
e
o
p
er
ati
o
n
al
s
p
ee
d
.
T
h
u
s
,
w
e
p
r
es
en
t W
r
a
p
p
er
f
o
r
I
m
ag
e
E
x
tr
ac
t
io
n
u
s
in
g
DOM
an
d
J
SO
N
(
W
E
I
D
J
)
m
o
d
e
l
in
d
eta
ils
t
o
ex
t
r
ac
t
i
m
ag
es
f
r
o
m
a
w
eb
p
ag
e
.
E
v
e
r
y
w
eb
p
ag
e
is
m
ad
e
o
f
th
ei
r
o
w
n
s
tr
u
ctu
r
e
in
clu
d
es
m
ain
to
p
ic
,
r
e
lat
ed
t
o
p
ics
,
ad
d
i
ti
o
n
al
in
f
o
r
m
ati
o
n
,
a
d
v
e
r
tis
em
en
t,
c
o
n
ta
ct
in
f
o
r
m
atio
n
,
im
ag
e,
au
d
i
o
an
d
v
id
e
o
f
ile
.
W
eb
p
ag
es
p
r
o
v
id
es
l
ar
g
e
p
o
o
l
o
f
in
f
o
r
m
atio
n
f
o
r
p
e
o
p
le
.
T
h
es
e
in
f
o
r
m
atio
n
c
an
b
e
u
s
e
d
f
o
r
b
en
ef
i
cia
l
p
u
r
p
o
s
e
.
T
h
is
p
a
p
e
r
p
r
o
p
o
s
es
a
n
ew
to
o
l
to
ex
tr
ac
t
im
ag
es
th
at
w
ill
d
em
o
n
s
tr
ate
b
et
te
r
p
e
r
f
o
r
m
an
ce
th
an
ex
is
t
in
g
m
eth
o
d
s
s
u
ch
a
s
DOM
an
d
o
th
er
c
o
n
v
en
ti
o
n
al
m
eth
o
d
.
I
n
th
is
r
es
ea
r
ch
,
w
e
w
ill
h
ig
h
lig
h
t
th
e
ex
t
r
a
cti
o
n
p
r
o
b
lem
f
r
o
m
th
e
u
s
er
'
s
p
e
r
s
p
ec
tiv
e
w
ith
r
eg
ar
d
s
t
o
s
ea
r
ch
o
f
m
u
lti
m
ed
ia
in
f
o
r
m
at
io
n
.
T
h
e
in
itia
l p
r
o
ce
s
s
o
f
ex
tr
ac
ti
o
n
s
ta
r
ts
w
ith
d
escr
i
p
ti
o
n
o
f
tar
g
ete
d
w
eb
p
ag
e
w
h
ich
is
p
r
o
v
i
d
e
d
v
ia
q
u
er
y
in
ter
f
a
ce
.
Ou
r
p
r
o
p
o
s
ed
m
o
d
el,
W
E
I
D
J
aim
s
to
im
p
r
o
v
e
th
e
p
r
o
ce
s
s
in
g
tim
e
f
o
r
lo
a
d
in
g
im
ag
es,
th
e
ac
cu
r
a
cy
o
f
th
e
ex
t
r
a
cti
o
n
p
r
o
c
ess
an
d
it
is
m
o
r
e
ef
f
ic
ien
t
an
d
lig
h
t
w
eig
h
t
th
an
m
an
u
al
p
r
o
ce
s
s
.
T
h
is
is
b
e
ca
u
s
e
m
an
u
al
p
r
o
ce
s
s
o
f
ex
t
r
a
cti
o
n
is
t
im
e
c
o
n
s
u
m
in
g
.
T
h
e
r
em
ain
d
e
r
o
f
th
is
p
a
p
e
r
is
o
r
g
an
i
ze
d
as
f
o
ll
o
w
s
:
T
h
e
r
ela
te
d
w
o
r
k
s
an
d
a
p
p
lic
at
io
n
s
a
r
e
d
is
cu
s
s
ed
in
n
ex
t
s
ec
t
io
n
.
Sp
e
ci
a
l
in
te
r
est
in
teg
r
a
tin
g
DOM
an
d
J
SON
h
as
b
ee
n
f
o
cu
s
ed
in
ex
t
r
a
ctin
g
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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2
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2
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d
o
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J
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lec
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n
g
&
C
o
m
p
Sci,
Vo
l.
9
,
No
.
3
,
Ma
r
ch
2
0
1
8
:
7
5
2
–
7
6
3
754
in
f
o
r
m
atio
n
f
r
o
m
w
eb
p
ag
e
i
n
W
E
I
D
J
M
o
d
e
l.
S
ec
t
io
n
R
e
s
u
lts
d
em
o
n
s
tr
at
es
th
e
ex
p
er
i
m
en
tal
r
esu
lt
o
f
th
i
s
p
a
p
e
r
in
ex
tr
ac
t
in
g
i
m
ag
es
u
s
in
g
th
r
ee
ap
p
r
o
ac
h
.
Fin
ally
,
w
e
o
f
f
er
o
u
r
c
o
n
c
lu
s
io
n
s
an
d
p
la
n
s
f
o
r
f
u
tu
r
e
w
o
r
k
s
in
C
o
n
c
lu
s
io
n
.
2.
RE
L
AT
E
D
WO
RK
S
W
eb
d
ata
ex
tr
ac
tio
n
s
ar
e
ap
p
licatio
n
s
t
h
at
u
s
ed
to
ex
tr
ac
t
s
e
m
i
-
s
tr
u
ct
u
r
ed
d
ata
f
r
o
m
w
eb
p
ag
e.
Usu
al
l
y
t
h
e
e
x
tr
ac
tio
n
p
r
o
ce
s
s
in
v
o
lv
ed
w
eb
d
ata
ex
tr
ac
tio
n
s
y
s
te
m
an
d
w
eb
s
o
u
r
ce
.
T
h
e
s
y
s
te
m
w
i
ll
i
n
ter
a
ct
w
it
h
th
e
w
eb
p
ag
e
a
n
d
ex
tr
ac
t
s
e
m
i
-
s
tr
u
c
tu
r
ed
d
ata.
T
h
e
ex
t
r
ac
ted
co
n
ten
t
s
m
a
y
co
n
tai
n
v
ar
io
u
s
ele
m
e
n
ts
o
f
m
u
lti
m
ed
ia
d
ata
s
u
c
h
as
a
u
d
i
o
,
v
id
eo
,
tex
t
an
d
i
m
a
g
e.
Af
t
er
ex
tr
ac
tio
n
p
r
o
ce
s
s
,
th
e
d
at
a
w
il
l
b
e
s
to
r
ed
in
te
m
p
o
r
ar
y
f
o
ld
er
o
r
d
ir
ec
tly
s
t
o
r
e
in
to
d
atab
ase.
T
h
ese
s
y
s
te
m
h
a
v
e
b
ee
n
d
e
v
elo
p
ed
to
ass
i
s
t
h
u
m
an
in
a
w
id
e
r
an
g
e
ap
p
licatio
n
s
.
T
h
e
ad
v
an
tag
e
s
o
f
w
eb
d
ata
e
x
tr
ac
ti
o
n
s
y
s
te
m
s
ar
e
it
ca
n
co
lle
ct
m
ea
n
i
n
g
f
u
l
d
ata
ef
f
icien
tl
y
a
n
d
d
ec
r
ea
s
e
h
u
m
an
e
f
f
o
r
t
in
s
tr
u
c
tu
r
ed
w
a
y
.
T
h
er
e
ar
e
m
an
y
d
i
s
cu
s
s
i
o
n
s
f
r
o
m
d
i
f
f
er
e
n
t
p
er
s
p
ec
tiv
es
ab
o
u
t
s
cie
n
ti
f
ic
m
et
h
o
d
s
an
d
tech
n
iq
u
e
s
.
T
h
e
d
esig
n
a
n
d
i
m
p
le
m
en
tatio
n
c
o
m
e
s
f
r
o
m
v
ar
io
u
s
d
is
cip
lin
ed
s
u
ch
a
s
m
ac
h
i
n
e
le
ar
n
in
g
,
n
at
u
r
al
la
n
g
u
a
g
e
p
r
o
ce
s
s
i
n
g
a
n
d
lo
g
ic.
2
.
1
Do
cum
ent
O
b
j
ec
t
M
o
d
el
(
D
O
M
)
T
h
e
Do
cu
m
en
t
Ob
j
ec
t
Mo
d
el
(
DOM
)
is
a
p
r
o
g
r
am
m
in
g
A
P
I
f
o
r
h
tm
l
an
d
x
m
l
d
o
cu
m
en
ts
.
Pe
o
p
le
ca
n
c
r
e
at
e
an
d
b
u
il
d
d
o
cu
m
en
ts
u
s
in
g
DOM
.
B
esi
d
es
th
at
,
th
is
m
o
d
el
ca
n
b
e
u
s
e
d
t
o
m
an
ip
u
late
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N
ar
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ad
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e
t
al
.
[
9
]
d
e
v
elo
p
e
d
p
ag
e
l
ev
el
d
at
a
ex
t
r
a
cti
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y
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tem
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s
in
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t
r
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h
e
r
e
a
r
e
tw
o
ty
p
es
o
f
tech
n
i
q
u
e
f
o
r
d
at
a
ex
t
r
a
cti
o
n
;
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n
l
in
e
an
d
o
f
f
lin
e
m
o
d
e
.
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lin
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m
o
d
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is
ap
p
li
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in
r
ea
l
tim
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ex
tr
ac
ti
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b
u
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f
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s
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e
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r
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to
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e
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tem
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ill
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l
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m
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at
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at.
San
g
ee
th
a
[
1
0
]
p
r
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p
o
s
e
d
a
t
o
o
l
th
at
ca
n
p
r
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ce
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th
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R
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Desc
r
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p
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Fr
am
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w
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k
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R
DF)
B
ase
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Sea
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d
D
OM
B
as
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d
Se
ar
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h
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ex
tr
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r
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lev
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cy
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ata
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R
DF
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s
e
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al
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w
ith
DOM
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s
e
r
q
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e
r
y
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r
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h
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m
en
t
f
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s
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g
alg
o
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aly
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r
o
m
w
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Me
h
ta
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d
Na
r
v
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r
[
1
1
]
p
r
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p
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s
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d
a
n
d
r
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d
es
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n
ed
b
asi
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OM
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p
p
r
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ten
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ex
t
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ac
ti
o
n
t
o
m
ak
e
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li
ca
b
l
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f
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r
d
if
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er
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n
t
w
eb
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ag
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tr
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ch
as
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lo
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r
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m
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ar
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cles
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h
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to
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l
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an
ex
tr
a
ct
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f
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r
m
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n
b
ase
d
o
n
tw
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d
if
f
er
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t
s
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ar
ch
in
g
m
eth
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u
n
ti
m
e
g
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l
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t
an
d
St
o
r
e
d
U
R
L
lis
t.
2
.
2
J
a
v
a
Sc
rip
t
O
bj
ec
t
N
o
t
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t
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o
n
(
J
SO
N)
T
h
e
d
ev
elo
p
m
en
t
o
f
w
eb
ap
p
licatio
n
s
h
as
b
ec
o
m
e
attr
ac
tiv
e
d
is
cip
lin
ed
in
th
e
w
eb
en
v
ir
o
n
m
e
n
t.
T
h
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u
s
e
an
d
co
m
p
o
s
it
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n
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f
d
if
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n
t
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P
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tech
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m
p
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d
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n
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lu
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n
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ap
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licatio
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s
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h
is
is
s
u
e
n
ee
d
to
b
e
d
ea
l
to
d
is
co
v
er
J
SON
ap
p
r
o
ac
h
b
ased
o
n
t
h
e
w
eb
.
I
n
r
ec
en
t
y
ea
r
s
,
a
n
e
w
tech
n
o
lo
g
y
,
J
SON
b
ased
o
n
w
eb
ap
p
licatio
n
s
h
a
s
b
ee
n
s
p
r
ea
d
in
g
t
h
e
w
eb
en
v
i
r
o
n
m
e
n
t.
J
SON
is
a
lig
h
t
w
ei
g
h
t
d
ata
-
i
n
ter
ch
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n
g
e
f
o
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m
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I
t
is
s
e
lf
-
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escr
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i
n
g
a
n
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n
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ta
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t
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f
o
r
d
ata
ex
tr
ac
tio
n
an
d
q
u
er
y
r
etr
iev
al
[
12
]
.
J
SON,
DOM
an
d
X
ML
ar
e
d
if
f
er
en
t
tech
n
o
lo
g
ies
t
h
at
h
av
e
b
ee
n
d
ev
elo
p
ed
to
s
o
lv
e
d
if
f
er
e
n
t
p
r
o
b
lem
s
.
T
h
e
y
ar
e
d
esig
n
ed
f
o
r
d
if
f
er
e
n
t p
u
r
p
o
s
e
.
T
a
b
le
1
d
is
cu
s
s
ed
d
if
f
er
e
n
t te
ch
n
o
lo
g
ies o
f
J
SON,
DOM
a
n
d
XM
L
.
T
ab
le
1
.
C
o
m
p
ar
is
o
n
s
o
f
Di
f
f
e
r
en
t T
ec
h
n
o
lo
g
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Jav
a
S
c
r
i
p
t
O
b
j
e
c
t
N
o
t
a
t
i
o
n
(
JS
O
N
)
D
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me
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b
j
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c
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M
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l
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D
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l
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M
a
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k
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p
L
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g
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w
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d
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t
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mat
.
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ma
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O
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n
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ml
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me
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s
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d
t
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t
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p
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t
d
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t
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.
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s
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a
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ma
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d
mac
h
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M
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e
t
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JS
O
N
.
T
h
e
w
o
r
k
b
y
[
13
-
15
]
p
r
o
p
o
s
ed
Du
ck
y
f
o
cu
s
ed
o
n
th
e
d
ata
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tio
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.
D
u
ck
y
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as
a
s
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m
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-
au
to
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at
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s
y
s
te
m
u
s
i
n
g
J
SON
ap
p
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w
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ich
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n
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in
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m
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n
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u
c
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th
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co
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ig
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ll
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ly
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y
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s
in
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SON
f
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at.
Evaluation Warning : The document was created with Spire.PDF for Python.
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J
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&
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N:
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(
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ma
lin
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h
ma
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)
755
W
an
g
[
1
6
]
p
r
o
p
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s
ed
r
ec
u
r
s
iv
e
alg
o
r
ith
m
to
tr
an
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late
XM
L
an
d
J
SON
o
b
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ts
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s
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ased
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esear
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v
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d
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to
XM
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an
d
J
SON
ar
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w
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s
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t
h
is
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x
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m
e
n
tal
w
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k
,
J
SON
is
an
a
l
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as
s
tr
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SO
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aster
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DO
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j
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ts
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J
SON
h
as
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.
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J
SON
an
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in
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2
.
3
Wr
a
pp
e
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No
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ay
s
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m
an
y
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y
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tem
s
f
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d
a
ta
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ac
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m
w
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p
ag
es
h
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b
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d
ev
el
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p
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d
[
17
]
.
A
tr
a
d
i
ti
o
n
al
a
p
p
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a
ch
is
to
w
r
ite
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p
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p
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tr
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b
y
L
ae
n
d
e
r
,
et
al
.
[
1
8
]
.
A
lar
te
,
et
al
.
[
1
9
]
p
r
o
p
o
s
e
d
a
m
eth
o
d
th
at
ca
n
r
em
o
v
e
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el
ev
an
t
in
f
o
r
m
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n
f
r
o
m
w
eb
t
em
p
late
.
DOM
t
r
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is
u
s
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d
t
o
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ly
s
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e
s
im
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er
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k
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a
ly
s
is
.
A
b
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in
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al
.
[
2
0
]
in
t
r
o
d
u
ce
d
an
au
t
o
m
ated
u
n
s
tr
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c
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d
ata
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ap
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r
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o
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u
ltim
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ata
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icu
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o
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e
in
th
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o
m
m
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at
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ase
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t
o
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ag
e
.
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v
en
th
e
r
e
ar
e
m
an
y
to
o
ls
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d
tech
n
i
q
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es
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at
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t
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e
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u
cc
ess
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u
l
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an
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m
in
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n
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u
ctu
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d
at
a
t
o
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b
le
in
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o
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m
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u
t
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t
s
im
p
ly
d
o
n
o
t
w
o
r
k
w
h
en
it
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m
es
to
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n
s
tr
u
ctu
r
e
d
o
r
s
em
i
-
s
tr
u
ctu
r
e
d
d
ata
.
W
eb
w
r
ap
p
er
is
a
p
r
o
ce
d
u
r
e
t
h
at
m
ig
h
t
i
m
p
le
m
e
n
t
s
ev
er
al
o
f
tech
n
iq
u
e
s
in
t
h
eir
alg
o
r
it
h
m
s
.
T
h
e
g
o
al
is
to
s
ee
k
a
n
d
f
in
d
d
ata
r
e
q
u
ir
ed
b
y
h
u
m
a
n
u
s
er
s
w
h
ic
h
is
e
x
tr
ac
tin
g
u
n
s
tr
u
ct
u
r
ed
o
r
s
e
m
i
-
s
tr
u
ct
u
r
ed
d
ata
f
r
o
m
w
eb
s
o
u
r
ce
s
.
Fi
n
all
y
t
h
e
d
ata
w
ill
b
e
tr
a
n
s
f
o
r
m
ed
i
n
to
s
tr
u
ct
u
r
ed
d
ata
f
o
r
m
u
lti
-
p
u
r
p
o
s
e.
L
atel
y
,
t
h
e
p
r
o
b
lem
o
f
ex
tr
ac
ti
n
g
in
f
o
r
m
atio
n
f
r
o
m
u
n
k
n
o
w
n
s
ite
s
is
g
etti
n
g
m
u
ch
atte
n
tio
n
,
b
u
t
t
h
e
o
n
l
y
co
n
cl
u
s
iv
e
r
esu
lt
s
ar
e
r
eg
ar
d
in
g
u
n
s
tr
u
c
tu
r
ed
o
r
s
em
i
-
s
tr
u
c
tu
r
ed
d
o
cu
m
e
n
t
s
.
T
h
e
th
e
m
e
o
f
W
eb
Data
E
x
tr
ac
tio
n
i
s
co
v
er
ed
b
y
a
n
u
m
b
er
o
f
r
ev
i
e
w
s
.
Fer
r
ar
a
et
al.
[
17
]
p
r
ese
n
ted
a
s
u
r
v
e
y
to
o
ls
a
n
d
tech
n
iq
u
es
o
v
er
v
ie
w
f
o
r
W
eb
Data
E
x
tr
ac
tio
n
.
T
h
e
g
o
al
o
f
t
h
is
s
u
r
v
e
y
is
to
p
r
o
v
id
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a
s
tr
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ct
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r
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d
co
m
p
r
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n
s
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v
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ie
w
o
f
t
h
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f
W
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Data
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x
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ti
o
n
.
I
n
2
0
0
8
,
a
r
elev
an
t
s
u
r
v
e
y
o
n
in
f
o
r
m
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n
ex
tr
ac
t
io
n
h
a
s
b
ee
n
d
is
cu
s
s
ed
b
y
[
21
]
.
T
h
is
p
ap
er
b
eliev
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th
a
t
th
e
au
to
m
atic
e
x
tr
ac
tio
n
o
f
i
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m
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f
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m
u
n
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u
c
tu
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o
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r
ce
s
h
a
s
o
p
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u
p
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w
a
v
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es
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q
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ata
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y
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p
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m
a
n
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tr
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ct
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r
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d
atab
ases
a
n
d
th
e
ab
u
n
d
a
n
ce
o
f
u
n
s
tr
u
ct
u
r
ed
d
ata.
Fles
ca
,
et
al.
[
2
2
]
s
u
r
v
e
y
ed
ap
p
r
o
ac
h
es
,
tech
n
iq
u
es a
n
d
to
o
ls
f
o
r
ex
tr
ac
tin
g
in
f
o
r
m
at
io
n
av
a
ilab
le
o
n
t
h
e
W
eb
.
I
n
T
ab
le
2
,
w
e
s
u
m
m
ar
ize
ap
p
licatio
n
s
th
at
h
a
v
e
b
ee
n
d
ev
elo
p
ed
f
o
r
s
e
m
i
-
s
tr
u
c
t
u
r
ed
d
ata
ex
tr
ac
tio
n
.
Ho
w
ev
er
,
t
h
er
e
is
n
o
t
m
u
ch
r
esear
c
h
d
o
n
e
p
er
tain
i
n
g
to
d
ata
ex
tr
ac
tio
n
f
o
r
m
u
lti
m
ed
ia
d
ata
s
u
c
h
as i
m
a
g
e,
au
d
io
an
d
v
id
eo
.
T
a
b
le
2
.
C
o
m
p
a
r
a
tiv
e
A
n
aly
s
i
s
o
f
Dat
a
E
x
t
r
a
cti
o
n
A
u
t
h
o
r
M
o
d
e
S
e
mi
-
st
r
u
c
t
u
r
e
d
D
a
t
a
T
e
x
t
A
u
d
i
o
V
i
d
e
o
I
mag
e
R
a
z
a
&
G
u
l
w
a
n
i
[
23
]
O
n
l
i
n
e
/
W
a
g
h
mare
&
M
a
r
a
l
[
24
]
O
f
f
l
i
n
e
/
N
a
r
a
w
a
d
e
e
t
a
l
.
[
9
]
O
n
l
i
n
e
O
f
f
l
i
n
e
/
S
o
n
g
,
S
u
n
,
&
L
i
a
o
[
25
]
O
n
l
i
n
e
/
B
h
a
r
d
w
a
j
&
M
a
n
g
a
t
[
26
]
O
n
l
i
n
e
/
/
/
/
K
a
d
a
m &
P
a
k
l
e
[
27
]
O
n
l
i
n
e
/
L
ó
p
e
z
e
t
a
l
.
[
28
]
O
n
l
i
n
e
/
A
b
i
d
i
n
,
I
d
r
i
s,
&
H
u
sa
i
n
[
20
]
O
n
l
i
n
e
/
/
/
/
Do
cu
m
e
n
t
Ob
j
ec
t
Mo
d
el
(
DOM
)
ca
n
b
e
ap
p
lied
d
ir
ec
tly
to
f
in
d
t
h
e
r
eq
u
ir
ed
in
f
o
r
m
a
tio
n
f
r
o
m
h
t
m
l
d
o
cu
m
en
ts
.
A
b
id
in
,
et
al.
[
2
0
]
co
n
s
tr
u
cted
DOM
tr
ee
s
tr
u
ct
u
r
e
o
n
t
h
e
f
ir
s
t
s
tep
.
T
h
en
,
u
n
n
ec
e
s
s
ar
y
n
o
d
es
s
u
c
h
as
s
cr
ip
t,
s
t
y
le
n
ee
d
to
b
e
f
ilter
e
d
.
C
lass
i
f
ic
atio
n
p
r
o
ce
s
s
is
i
m
p
o
r
ta
n
t
t
o
s
ea
r
ch
class
e
s
o
f
m
u
lti
m
ed
ia
d
ata.
Data
f
o
r
m
e
d
ia
w
ill
b
e
r
ec
o
g
n
ized
w
h
e
n
t
h
e
p
ar
s
er
f
o
u
n
d
w
o
r
d
“
s
r
c=
”
i
n
th
e
d
ata
s
tr
u
c
tu
r
e.
Fin
all
y
m
u
lti
m
ed
ia
d
ata
ca
n
b
e
ex
tr
ac
ted
.
Ho
w
e
v
er
,
it
h
as
b
ee
n
f
o
u
n
d
th
at
it
r
eq
u
ir
es
la
r
g
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a
m
o
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n
t
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f
p
r
o
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s
s
in
g
ti
m
e
d
u
r
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h
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ex
tr
ac
tio
n
p
r
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ce
s
s
o
f
w
eb
p
ag
es
th
at
co
n
s
i
s
t
o
f
lar
g
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t
m
l
s
tr
u
ctu
r
e.
B
esid
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th
at,
th
e
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x
tr
ac
tio
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p
r
o
ce
s
s
w
i
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x
tr
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t
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it
h
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r
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in
Fig
u
r
e
2
.
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E
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Mo
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is
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to
o
v
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co
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th
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li
m
itatio
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s
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f
DO
M
m
o
d
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in
ex
tr
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g
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.
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Fig
u
r
e
2
.
R
ep
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m
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g
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3.
WE
I
DJ
M
O
DE
L
T
h
is
r
esear
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p
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p
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s
es
th
e
in
f
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m
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n
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m
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d
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f
o
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d
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m
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-
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r
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d
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h
a
s
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g
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id
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x
t b
y
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s
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n
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D
o
cu
m
e
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t O
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t M
o
d
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(
DOM
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an
d
J
av
aScr
ip
t
Ob
j
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t
No
tatio
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(
J
SON)
.
B
ase
d
o
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th
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p
r
o
p
o
s
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r
atio
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o
d
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s
,
a
m
ed
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r
to
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l
ca
lled
as
a
w
r
ap
p
er
w
ill
b
e
d
ev
elo
p
ed
as
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p
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im
e
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ta
l
to
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tr
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t
s
e
m
i
-
s
tr
u
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r
ed
d
ata
f
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o
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h
e
ter
o
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u
s
s
o
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r
ce
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p
ag
es.
E
x
p
e
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i
m
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n
ts
w
ill
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e
co
n
d
u
cte
d
o
n
Seti
u
w
etla
n
d
s
w
eb
s
ite
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d
b
io
d
iv
er
s
it
y
w
eb
p
ag
e
s
d
ataset
f
o
r
tes
tb
ed
.
T
h
e
aim
o
f
th
is
w
o
r
k
is
to
f
i
n
d
ex
tr
ac
t
i
o
n
ap
p
r
o
ac
h
th
at
c
an
id
en
t
if
y
an
d
ex
tr
a
ct
im
ag
es.
I
n
th
is
p
a
p
e
r
,
w
e
p
r
o
p
o
s
e
W
E
I
D
J
m
o
d
e
l
t
o
ex
tr
a
ct
im
ag
es
f
r
o
m
a
w
e
b
p
a
g
e
as
s
h
o
w
n
in
Fig
u
r
e
3
.
I
t
als
o
m
in
es
im
ag
es
in
f
o
r
m
atio
n
an
d
f
o
cu
s
es
o
n
ar
r
an
g
in
g
th
e
ex
tr
a
ct
ed
d
at
a
in
a
tab
u
la
r
f
o
r
m
at.
T
h
is
to
o
l
aim
s
s
p
ee
d
an
d
p
e
r
f
o
r
m
an
ce
o
f
im
ag
e
ex
t
r
ac
t
io
n
.
L
o
ts
o
f
ap
p
l
ic
ati
o
n
s
w
o
r
k
ed
o
n
ex
tr
ac
t
in
g
in
f
o
r
m
ati
o
n
th
en
a
r
r
an
g
e
th
e
m
in
to
s
t
r
u
ctu
r
e
d
f
o
r
m
at
[
29
,
30
]
.
Min
in
g
in
f
o
r
m
atio
n
r
e
c
o
r
d
s
in
d
ata
r
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s
p
lay
s
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p
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ta
n
t
r
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l
e.
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t
b
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o
m
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tain
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l d
at
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s
u
ch
as im
ag
es,
tex
t,
au
d
i
o
an
d
v
id
eo
.
A
tech
n
i
q
u
e
is
n
ee
d
ed
f
o
r
th
e
p
r
o
c
ess
o
f
m
in
in
g
d
ata
a
r
e
a.
T
h
i
s
m
o
d
el
p
r
o
p
o
s
ed
DOM
t
r
e
e
t
o
m
in
e
d
ata
r
eg
io
n
s
in
w
eb
p
ag
e
.
Fig
u
r
e
3
.
W
E
I
DJ
ex
tr
ac
tio
n
m
o
d
el
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757
3
.
1
DO
M
T
re
e
Co
ns
t
ruct
io
n
I
n
itiall
y
f
o
r
in
f
o
r
m
at
io
n
e
x
tr
a
ctio
n
f
r
o
m
w
eb
p
ag
e,
w
eb
ad
d
r
ess
o
r
u
n
i
f
ied
r
eso
u
r
ce
lo
ca
to
r
(
u
r
l
)
o
f
w
eb
p
ag
e
is
r
eq
u
ir
ed
.
W
h
en
u
s
er
i
n
p
u
t
s
t
h
e
u
r
l
,
s
i
n
g
le
p
ag
e
is
t
h
e
ex
tr
ac
tio
n
tar
g
et
b
u
t
w
h
e
n
u
s
er
i
n
p
u
t
m
u
ltip
le
u
r
l
,
th
e
ex
tr
ac
tio
n
ta
r
g
et
ai
m
s
at
p
ag
e
-
w
id
e
in
f
o
r
m
atio
n
.
T
h
is
p
ap
er
o
n
ly
f
o
cu
s
es
o
n
r
ec
o
r
d
lev
el
ex
tr
ac
ti
o
n
ta
s
k
.
T
h
i
s
ap
p
r
o
ac
h
f
o
cu
s
es o
n
th
e
i
m
a
g
e
e
x
tr
ac
ti
o
n
f
r
o
m
s
u
r
f
ac
e
w
eb
.
Mo
s
t
w
e
b
s
ite
ar
e
d
ev
elo
p
ed
b
ased
o
n
th
e
h
t
m
l
f
o
r
m
at
r
ath
er
th
a
n
x
m
l.
B
asicall
y
DO
M
w
ill
b
e
ab
le
to
d
ef
in
e
an
d
m
a
n
ip
u
la
te
h
t
m
l
d
o
cu
m
en
ts
in
to
a
tr
ee
s
tr
u
c
t
u
r
e
[
9
]
.
I
t
d
ef
i
n
es
t
h
e
lo
g
ica
l
s
tr
u
ctu
r
e
o
f
d
o
cu
m
e
n
t
s
a
n
d
th
e
w
a
y
it
ca
n
b
e
ac
ce
s
s
ed
an
d
m
a
n
ip
u
lated
.
I
t
is
also
k
n
o
w
n
a
s
n
o
d
e
tr
ee
.
E
v
er
y
t
h
i
n
g
i
n
a
w
eb
p
ag
e
co
n
t
ain
s
h
t
m
l
ta
g
s
an
d
ele
m
e
n
ts
,
te
x
t n
o
d
es a
n
d
o
th
er
s
.
I
n
th
i
s
r
e
s
ea
r
ch
,
DO
M
is
ap
p
lied
in
h
t
m
l
d
o
cu
m
e
n
ts
to
f
o
r
m
a
w
eb
p
ag
e
i
n
to
a
p
atter
n
tr
ee
s
tr
u
ct
u
r
e.
A
lt
h
o
u
g
h
o
b
j
ec
ts
in
th
e
DOM
tr
ee
ca
n
b
e
m
a
n
ip
u
lated
u
s
i
n
g
ce
r
tain
m
eth
o
d
s
b
u
t
i
n
t
h
is
ca
s
e,
we
tr
an
s
f
o
r
m
t
h
e
s
tr
u
ctu
r
e
o
f
w
e
b
p
ag
e
in
to
tr
ee
s
tr
u
ct
u
r
e
to
r
ec
o
g
n
ize
d
ata
r
eg
io
n
s
.
T
h
is
p
r
o
ce
s
s
is
i
m
p
o
r
tan
t
b
ec
au
s
e
d
ata
r
eg
io
n
co
n
s
is
t
s
u
s
ef
u
l i
n
f
o
r
m
atio
n
t
h
at
i
s
w
ill b
e
r
etr
iev
ed
b
ased
o
n
h
t
m
l e
le
m
en
t.
E
v
er
y
w
eb
p
ag
e
is
d
ev
elo
p
e
d
u
s
in
g
h
t
m
l
ele
m
e
n
t.
E
ac
h
m
o
d
u
le
o
f
h
t
m
l
ele
m
en
t
i
s
u
s
ef
u
l
f
o
r
s
ev
er
al
d
ata
r
ec
o
r
d
s
.
T
h
is
m
o
d
u
le
d
i
s
co
v
er
s
th
e
wh
o
le
ele
m
en
t
i
n
w
eb
d
o
cu
m
e
n
t
s
s
u
c
h
as
<h
t
m
l>,
<ta
b
le>
,
<d
iv
>,
<i
m
g
>,
<f
o
r
m
>,
<
v
id
eo
>
an
d
s
o
o
n
.
A
ll
th
e
tag
s
w
i
ll
b
e
ex
tr
ac
ted
f
r
o
m
r
o
o
t
n
o
d
e
to
its
ch
ild
n
o
d
e
in
d
esi
g
n
in
g
w
eb
p
ag
e.
So
,
tag
s
ca
n
b
e
r
ec
o
g
n
ize
d
d
ata
r
eg
io
n
b
y
u
s
i
n
g
h
t
m
l e
l
e
m
en
t.
3
.
2
Da
t
a
Reg
io
n a
nd
Cla
s
s
if
ica
t
io
n
Mu
lti
m
ed
ia
d
ata
s
u
ch
a
s
i
m
ag
es,
v
id
eo
clip
s
,
an
i
m
atio
n
s
,
g
r
ap
h
ics
a
n
d
au
d
io
h
a
v
e
i
n
cr
ea
s
ed
r
ap
id
ly
o
v
er
th
e
p
ast
s
ev
er
al
y
ea
r
s
.
User
s
h
a
v
e
b
eg
u
n
to
ex
p
ec
t
th
at
m
u
l
ti
m
ed
ia
co
n
ten
t
s
s
h
o
u
ld
b
e
ea
s
ily
to
ac
ce
s
s
.
T
h
e
y
w
a
n
t
to
f
i
n
d
r
ele
v
an
t
i
m
a
g
es
th
at
ap
p
ea
r
in
w
e
b
p
ag
e,
s
ee
v
id
eo
clip
r
elate
d
to
tex
t
ar
ticles
t
h
e
y
r
ea
d
an
d
lis
ten
to
th
e
a
u
d
io
.
I
t
is
i
m
p
o
r
ta
n
t
to
p
r
o
v
id
e
in
te
g
r
ated
ac
ce
s
s
to
d
iv
er
s
e
t
y
p
es
o
f
m
u
lti
m
ed
ia
s
e
m
i
-
s
tr
u
ct
u
r
ed
d
ata
s
to
r
ed
in
d
is
p
a
r
ate
d
ata
s
o
u
r
ce
s
.
Ma
n
y
w
eb
d
ata
ex
tr
ac
to
r
s
to
d
ay
d
ea
l
w
it
h
m
u
lti
m
ed
ia
d
ata.
Data
class
if
icatio
n
i
s
i
m
p
o
r
tan
t
as
it
ca
te
g
o
r
ized
d
ata
b
ased
o
n
r
eq
u
ir
ed
n
ee
d
.
T
h
e
class
o
f
d
if
f
er
en
t
o
b
j
ec
ts
w
il
l b
e
id
en
ti
f
ied
in
d
ata
class
i
f
icatio
n
.
C
las
s
i
f
icatio
n
o
f
d
ata
p
atter
n
s
i
s
i
m
p
o
r
ta
n
t
f
o
r
d
ata
ex
t
r
ac
tio
n
f
r
o
m
th
e
w
eb
p
ag
e.
Fig
u
r
e
4
illu
s
tr
ates
t
h
e
p
r
o
ce
s
s
o
f
d
ata
ex
tr
ac
tio
n
a
n
d
class
i
f
icatio
n
.
T
h
er
e
ar
e
f
o
u
r
class
es
t
h
at
h
a
v
e
b
ee
n
id
en
ti
f
ied
;
i
m
a
g
e,
tex
t,
au
d
io
an
d
v
id
eo
.
T
h
ese
m
u
lt
i
m
ed
ia
d
ata
w
ill
b
e
id
en
tif
ied
w
h
en
t
h
e
p
ar
s
er
h
as
f
o
u
n
d
th
e
w
o
r
d
“
s
r
c=
”
i
n
t
h
e
d
ata
s
tr
u
ct
u
r
e
d
u
r
in
g
th
e
e
x
tr
ac
tio
n
p
r
o
ce
s
s
.
T
h
is
is
a
k
e
y
w
o
r
d
f
o
r
m
u
lt
i
m
ed
ia
d
ata
s
o
u
r
ce
r
ef
er
en
ce
to
lo
ca
te
th
e
s
o
u
r
ce
d
ata
th
at
h
a
s
b
ee
n
u
s
ed
.
W
h
en
lo
ca
tio
n
o
f
th
e
r
eq
u
ir
ed
s
o
u
r
ce
is
d
eter
m
i
n
ed
,
th
e
p
ar
s
er
w
i
ll
id
en
ti
f
y
it
s
d
a
ta
t
y
p
e.
T
ab
le
3
s
h
o
w
s
d
ata
s
o
u
r
ce
f
o
r
m
u
lti
m
e
d
ia
d
ata
th
at
co
n
tain
s
in
h
t
m
l
d
o
cu
m
en
ts
.
Fig
u
r
e
4
.
Data
class
es
T
ab
le
3
.
Data
So
u
r
ce
o
f
Me
d
i
a
Ty
p
e
„
sr
c
‟
-
so
u
r
c
e
r
e
f
e
r
e
n
c
e
T
e
x
t
<
a
>
<
p
>
<
b
r
>
<
f
o
n
t
>
<
si
z
e
>
I
mag
e
“
sr
c
=
*
.
j
p
g
,
g
i
f
,
p
n
g
,
b
mp
”
A
u
d
i
o
“
sr
c
=
*
.
w
a
v
,
mp
3
,
r
a
w
,
mi
d
i
”
V
i
d
e
o
“
sr
c
=
*
.
f
l
v
,
w
mx
,
mp
4
,
a
v
i
”
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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N
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2
5
0
2
-
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n
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&
C
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3
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r
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7
6
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758
3
.
3
Co
nte
nt
Str
uct
ure
Dev
el
o
p
m
e
nt
P
ro
ce
s
s
us
ing
Vis
ua
l Seg
m
e
nta
t
io
n
A
v
is
u
al
s
eg
m
en
tatio
n
is
d
ev
e
l
o
p
e
d
u
s
in
g
ea
ch
le
af
n
o
d
e
as
a
n
o
b
ject
.
Vis
u
al
s
eg
m
en
tati
o
n
h
as b
e
en
p
r
o
p
o
s
e
d
b
e
ca
u
s
e
it
is
e
asi
er
t
o
u
n
d
er
s
tan
d
t
h
e
s
t
r
u
ctu
r
e
o
f
w
eb
p
ag
e
v
is
u
ally
co
m
p
a
r
e
d
t
o
t
ex
tin
g
in
d
e
tai
ls
.
T
h
is
s
eg
m
en
tati
o
n
is
im
p
o
r
t
an
t
t
o
ch
e
ck
w
h
eth
er
th
e
r
e
a
r
e
i
n
f
o
r
m
atio
n
th
at
ar
e
r
e
q
u
ir
e
d
i
n
ea
ch
b
l
o
ck
.
W
h
en
co
n
d
u
ctin
g
th
e
ex
p
er
im
en
t
o
n
im
ag
e
ex
tr
ac
ti
o
n
u
s
in
g
DOM
an
d
J
SO
N
m
eth
o
d
,
it
h
as
b
e
e
n
f
o
u
n
d
th
at
n
o
t
a
ll
im
ag
es
ca
n
b
e
ex
tr
ac
te
d
.
A
s
a
s
o
lu
ti
o
n
,
e
ac
h
b
l
o
ck
m
u
s
t
b
e
c
h
ec
k
e
d
w
h
eth
er
th
ey
h
av
e
im
ag
es
o
r
n
o
t
.
Fig
u
r
e
5
s
h
o
w
s
an
ex
am
p
le
o
f
v
is
u
a
l s
e
g
m
en
tatio
n
o
f
lay
o
u
t
s
tr
u
ctu
r
e
f
o
r
w
ww
.
ww
f
.
o
r
g
.
m
y
.
Fig
u
r
e
5
.
Vis
u
al
s
eg
m
en
tati
o
n
o
f
l
ay
o
u
t st
r
u
ctu
r
e
I
n
th
is
lev
el
,
w
e
ai
m
to
f
in
d
all
s
u
ita
b
le
v
is
u
al
b
l
o
ck
c
o
n
ta
i
n
ed
in
th
e
cu
r
r
en
t
w
eb
p
ag
e.
B
as
ica
lly
,
ev
er
y
n
o
d
e
in
th
e
D
OM
t
r
e
e
c
an
b
e
p
r
es
en
te
d
as
a
v
is
u
al
b
l
o
ck
b
u
t
n
o
d
es
s
u
ch
as
<
T
A
B
L
E
>
an
d
<
P>
a
r
e
n
o
t
s
u
itab
le
t
o
b
e
r
e
p
r
esen
t
ed
as
a
s
in
g
le
v
is
u
al
b
lo
ck
.
T
h
is
is
b
ec
au
s
e
th
ey
ar
e
c
o
m
m
o
n
ly
u
s
ed
f
o
r
o
r
g
an
iz
ati
o
n
p
u
r
p
o
s
e
.
S
ev
e
r
al
r
u
les
a
r
e
c
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Fig
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RE
SU
L
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ize
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.
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m
en
tat
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n
,
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n
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ts
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d
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.
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