12. hypermedia and documents – syntax – hyperlinks contents · 12. hypermedia and documents...
TRANSCRIPT
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
1 / 2
6C
onte
nts
12.1
Mul
timed
ia D
ocum
ents
12.2
Hyp
erte
xt–
Hyp
erm
edia
–H
yper
links
and
Nav
igat
ion
12.3
The
Wor
ld W
ide
Web
(W
WW
)–
Fun
ctio
nal M
odel
–H
yper
links
12.4
Sta
ndar
d G
ener
aliz
ed M
arku
pL
angu
age
(SG
ML
)–
Tag
cat
egor
ies
–D
ocum
ent
Pro
cess
ing
–O
bjec
t C
lass
es
–S
ched
ulin
g of
Obj
ects
12.5
Hyp
erte
xt M
arku
p L
angu
age
(HT
ML
)–
Syn
tax
–H
yper
links
12.6
Mul
timed
ia a
nd H
yper
med
iaIn
form
atio
n C
odin
g E
xper
t Gro
up(M
HE
G)
–S
tand
ardi
satio
n
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
2 / 2
612
.1 M
ultim
edia
Doc
umen
ts
Hyp
erte
xt a
nd H
yper
med
ia S
yste
ms:
–W
WW
Rep
rese
ntat
ion
of H
yper
med
ia D
ocum
ents
:
–S
GM
L
–H
TM
L
–M
HE
G
Mul
tim
edia
Doc
umen
t
–A
doc
umen
t whi
ch is
com
pris
ed o
f inf
orm
atio
n co
ded
at le
ast o
ne c
ontin
uous
(tim
e-de
pend
ent)
med
ium
and
one
dis
cret
e (t
ime-
inde
pend
ent)
med
ium
.
Í n
eed
for
med
ia s
ynch
roni
satio
n
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
3 / 2
6
Pre
sent
atio
n M
odel
Man
ipul
atio
nM
odel
Rep
rese
ntat
ion
Mod
el
Con
tent
Stru
ctur
e
12.1
Mul
timed
ia D
ocum
ents
/ A
rchi
tect
ure
Exc
hang
ing
docu
men
ts r
equi
res
that
the
docu
men
t arc
hite
ctur
e is
kno
wn.
Thi
s re
quir
es a
defi
nitio
n of
the
docu
men
t arc
hite
ctur
e.
Con
tent
:–
mu
lti-
/ m
on
omed
ia in
form
atio
n
Stru
ctur
e:–
spa
tial a
nd
tem
po
ral r
ela
tion
s b
etw
ee
nin
form
atio
n
Man
ipul
atio
n M
odel
:–
ope
ratio
n al
low
ed
for
crea
tion,
cha
nge
and
dele
tion
of in
form
atio
n
Rep
rese
ntat
ion
Mod
el:
–ex
cha
ng
e p
roto
col a
nd
data
form
at
Pres
enta
tion
Mod
el:
–ru
les
for
do
cum
en
t pr
ese
nta
tion
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
4 / 2
612
.2 H
yper
text
Hyp
erte
xt S
yste
m (
coin
ed b
y T
ed N
elso
n 19
65):
–sy
stem
that
allo
ws
to r
ead
(hyp
erte
xt)
docu
men
tsno
nlin
early
Nod
e-L
ink
Hyp
erte
xt M
odel
:
–In
divi
dual
ly c
hunk
s of
info
rmat
ion
(nod
es)
are
set i
nre
latio
n by
mea
ns o
f Hyp
erlin
ks
–H
yper
link:
rel
atio
n be
twee
n tw
o or
mor
e no
des
–H
yper
text
Doc
umen
t: di
stin
ct s
et o
f nod
es a
nd li
nks
whi
ch c
onst
itute
s a
logi
cal e
ntity
–H
yper
web
: dis
tinct
set
of h
yper
links
Lin
ear
text
Hyp
erte
xt
Sou
rce
Sin
kIn
term
ed.
vers
ion
Lin
ea
rlyre
pres
ente
d
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
5 / 2
612
.2 H
yper
text
/ A
rchi
tect
ure
Pre
sent
atio
n la
yer,
bas
ed o
n a
give
n st
ruct
ure
and
user
´s d
ispl
ay it
is d
ecid
ed:
–w
hich
dat
a to
pre
sent
–ho
w th
e da
ta a
re p
rese
nted
Hyp
erte
xt a
bstr
act m
achi
ne, c
onst
ruct
s th
e da
ta s
truc
ture
for
man
agem
ent o
f the
docu
men
t
Sto
rage
laye
r (d
atab
ase
laye
r), h
andl
es a
ll fu
nctio
ns w
hich
are
con
cern
ed w
ith
stor
age
of d
ata;
Tra
nsac
tion
hand
ling
as w
ith d
atab
ases
;
Nod
es a
nd p
oint
ers
of h
yper
text
doc
umen
ts a
re p
roce
ssed
as
data
obj
ects
with
out
any
sem
antic
s
lowerlayerupper
3 la
yers
with
dif
fere
nt f
unct
iona
litie
s:
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
6 / 2
612
.2 H
yper
text
/ H
yper
med
ia
Hyp
erm
edia
is th
e ge
nera
lisat
ion
of H
yper
text
to in
clud
e dy
nam
ic m
edia
like
aud
iocl
ips
and
vide
o cl
ips.
Sync
hron
isat
ion
and
linki
ng o
f th
ese
med
ia e
lem
ents
to o
ther
ele
men
ts m
ust b
epo
ssib
le.
Hyp
erm
edia
sys
tem
s al
low
inte
ract
ive,
inte
grat
ed a
nd s
ynch
roni
sed
pres
enta
tion
ofm
ultim
edia
info
rmat
ion. M
ulti
med
iaH
yper
med
iaH
yper
text
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
7 / 2
612
.2 H
yper
text
/ H
yper
links
and
Nav
igat
ion
A u
ser
trav
erse
s th
e hy
perw
eb b
y na
viga
ting
thro
ugh
hype
rlin
ks (
navi
gatio
n =
forw
ard
mov
emen
t in
line
arly
sor
ted
docu
men
ts).
Hyp
erli
nk c
lass
ific
atio
n:–
num
ber
of e
nds:
1:1,
1:m
, n:m
–lin
k di
rect
ion:
dire
ctio
nal,
bi-d
irect
iona
l
–lin
k ty
pe:
foot
note
, tex
tual
ref
eren
ce, n
ext p
age,
pre
sent
atio
n op
tions
Anc
hors
:–
Anc
hors
are
link
end
s (o
rigin
or
dest
inat
ion
of a
hyp
erlin
k) li
ke te
xt p
arts
,gr
aphi
c ar
eas
or te
mpo
ral p
ositi
ons
of a
n au
dio/
vide
o st
ream
.
Nod
e: –In
form
atio
n un
it of
a h
yper
text
doc
umen
t
Poin
ter,
Lin
k:–
Edg
e of
a h
yper
text
gra
ph
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
8 / 2
612
.3 T
he W
orld
Wid
e W
eb (
WW
W)
Inte
rnet
-wid
e di
stri
bute
d hy
perm
edia
info
rmat
ion
retr
ieva
l sys
tem
prov
ides
acc
ess
to la
rge
univ
erse
of
docu
men
ts
Clie
nt-s
erve
r m
odel
:
–cl
ient
s: (
Web
bro
wse
rs)
colle
ctio
n of
pro
gram
s w
hich
can
sen
d re
ques
ts fo
r
docu
men
ts to
WW
W s
erve
rs
–se
rver
s: p
rogr
ams
that
, afte
r th
ey r
ecei
ve r
eque
sts,
sen
d ba
ck th
e ap
prop
riate
answ
ers
- ei
ther
doc
umen
ts o
r er
ror
mes
sage
s
Ma
jor
WW
W “
sta
nd
ard
s“:
HT
TP
: Hyp
ert
ext
Tra
nsf
er
Pro
toco
l
UR
L: U
nifo
rm R
esou
rce
Loca
tor
HT
ML
: Hyp
erT
ext
Ma
rku
p L
an
gu
ag
e
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
9 / 2
612
.3 T
he W
orld
Wid
e W
eb /
Func
tiona
l Mod
el
Prox
y br
eaks
up
the
conn
ectio
n in
to c
lient
/pro
xy a
nd p
roxy
/ser
ver
requ
ests
and
res
pons
es.
Allo
ws
for
–ca
chin
g (p
roxy
of t
he R
WT
H h
as a
hit
rate
of 3
0%)
–pr
efet
chin
g (p
roxy
pre
fetc
hes
the
links
incl
uded
in th
e la
st r
eque
sted
doc
umen
t)
–us
age
of d
edic
ated
(tr
ansp
ort)
prot
ocol
s be
twee
n cl
ient
/pro
xy a
nd s
erve
r/pr
oxy
–co
nver
sion
of t
rans
ferr
ed c
onte
nt to
mee
t the
clie
nt r
equi
rem
ents
and
tran
sfer
med
ium
(e.g
. low
ban
dwith
tran
sfer
med
ium
like
wirl
ess
acce
ss o
r cl
ient
with
b&
w s
cree
n)
Set
of W
WW
Ser
vers
Clie
nt (
Bro
wse
r)
Req
uest
Res
pons
e
Req
uest
Res
pons
e
Pro
xy(o
pti
on
al)
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
10 /
2612
.3 T
he W
orld
Wid
e W
eb /
Hyp
erlin
ks
”Nod
es”
–ar
e h
ype
rte
xt d
ocu
me
nts
re
pre
sen
ted
by
Hyp
ert
ext
Ma
rku
p L
an
gua
ge (
HT
ML
) o
r a
rbitr
ary
info
rmat
ion
obje
cts
refe
renc
ed b
y m
eans
of
an U
nifo
rm R
eso
urce
Loc
ato
r (U
RL)
Hyp
erlin
ks
–ar
e e
mb
ed
de
d in
HT
ML
doc
umen
ts
”Sou
rce
anch
ors”
–ar
e te
xt p
ortio
ns o
r im
ages
re
gion
s in
clud
ed in
HT
ML
docu
men
ts
”Des
tinat
ion
anch
ors”
–ar
e e
ithe
r in
form
atio
n o
bje
cts
ad
dre
ssa
ble
th
rou
gh
a U
RL
or
spe
cific
pa
rts
of
HT
ML
do
cum
en
ts
Lin
ks
–ar
e d
irec
tion
al p
oin
t to
poi
nt
”Lin
k ty
pe”
–is
alw
ays
a r
efe
ren
ce f
or
furt
he
r re
ad
ing
–F
urt
he
r in
form
atio
n in
add
itio
n t
o th
e p
ure
lin
k b
etw
ee
n t
wo
no
des.
–E
xam
ple
: d
iffe
ren
tiatio
n b
etw
ee
n d
iffe
ren
t ki
nd
s o
f de
stin
atio
n n
od
es
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
11 /
2612
.3 T
he W
orld
Wid
e W
eb /
Prob
lem
s
Prob
lem
s:
–U
sers
can
get
“lo
st in
hyp
ersp
ace“
doc
umen
ts a
re a
rbitr
arily
str
uctu
red,
no
over
view
pos
sibl
e
–D
iffic
ult t
o fi
nd in
form
atio
n (s
earc
h en
gine
s ha
ve s
cala
bilit
y pr
oble
ms)
–N
o ve
rsio
n co
ntro
l of d
ocum
ents
(de
tect
ion
of o
utda
ted
info
rmat
ion)
–N
o su
ppor
t for
doc
umen
t aut
horin
g
–N
o lin
k co
nsis
tenc
y: d
angl
ing
links
are
cre
ated
by
the
dele
tion
of o
ne li
nk e
nd
–Lo
w p
erfo
rman
ce a
nd h
igh
netw
ork
load
(so
lutio
n: p
roxy
ser
vers
)
–N
o lin
king
bet
wee
n dy
nam
ic m
edia
pos
sibl
e (n
o re
al h
yper
med
ia)
... (
muc
h
mo
re)
Íle
ads
to s
econ
d ge
nera
tion
hype
rmed
ia s
yste
ms
like
Hyp
er-G
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
12 /
2612
.4 S
tand
ard
Gen
eral
ized
Mar
kup
Lan
guag
e (S
GM
L)
Aut
hors
:–
prep
are
cont
ent,
spec
ify in
a u
nifo
rm w
ay th
e tit
les,
tabl
es w
ithou
t any
des
crip
tion
of th
eac
tual
rep
rese
ntat
ion.
Publ
ishe
r:–
spec
ifies
res
ultin
g la
yout
.
Bas
ic id
ea:
–a
utho
r us
es T
AG
S fo
r m
arki
ng c
erta
in te
xt p
arts
that
are
late
r su
bjec
t of t
he la
yout
proc
ess.
SGM
L:
–de
term
ines
the
form
of t
ags,
but
doe
s no
t spe
cify
thei
r m
eani
ng.
–m
akes
a fr
ame
ava
ilabl
e th
at e
nabl
es
the
user
to s
peci
fy th
e sy
ntax
des
crip
tion
in a
nob
ject
-spe
cific
sys
tem
–sp
ecifi
es s
ynta
x, n
ot s
eman
tics
Exa
mpl
e:<
title
>M
ultim
edia
Pre
sent
atio
n</t
itle
>
<au
thor
>O
. Spa
niol
</a
utho
r>
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
13 /
2612
.4 S
GM
L /
Tag
cat
egor
ies
Des
crip
tive
mar
kup
tags
:–
des
crib
e a
ctua
l str
uctu
re
Ent
ity r
efer
ence
:–
conn
ect
ion
to a
noth
er
elem
ent,
sim
ilar
to a
n a
bbre
via
tion;
the
act
ual c
onte
nt o
f the
ref
eren
ce c
an
bein
sert
ed la
ter
at t
he
corr
esp
ond
ing
pla
ce
Mar
kup
decl
arat
ions
:–
de
fine
th
e e
lem
en
ts to
wh
ich
an
ent
ity r
efe
ren
ce r
efe
rs c
an
be
use
d to
de
fine
ru
les
for
the
str
uct
ure
of
a d
ocu
me
nt
Proc
essi
ng in
stru
ctio
ns (
e.g.
for
the
form
atte
r or
for
oth
er p
rogr
ams)
pape
r
post
ambl
ebo
dypr
eam
ble
title
auth
orad
ress
char
acte
rs
chap
ter
1
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
14 /
2612
.4 S
GM
L /
Doc
umen
t Pro
cess
ing
SGM
L d
ocum
ent p
roce
ssin
g ha
s tw
o pr
oces
ses:
1. P
arse
r -
uses
the
tags
occ
urin
g in
the
docu
men
t in
com
bina
tion
with
the
docu
men
t
type
spe
cifi
catio
n. T
he s
peci
fica
tion
of th
e do
cum
ent s
truc
ture
is d
one
with
tags
.
2. F
orm
atte
r -
know
s th
e m
eani
ng o
f th
e ta
g an
d tr
ansf
orm
s th
e do
cum
ent i
nto
a
form
atte
d do
cum
ent
SGM
L lo
gica
l str
uctu
res
are
defi
ned
by m
arku
p co
mm
ands
that
are
inse
rted
in
the
text
(ta
gs)
Mar
kup
divi
des
the
text
into
SG
ML
ele
men
ts
For
each
SG
ML
doc
umen
t a D
ocum
ent T
ype
Def
init
ion
exis
ts (
DT
D)
DT
D d
ecla
res
the
elem
ent t
ype
of a
doc
umen
t, at
trib
utes
of
the
elem
ents
and
hier
arch
y of
the
inst
ance
s
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
15 /
26
HT
ML
is a
SG
ML
Doc
umen
t Typ
e D
efin
ition
(D
TD
)
The
HT
ML
DT
D d
efin
es ta
gs f
or
–de
scrib
ing
the
text
str
uctu
re (
not t
he la
yout
)
–cr
eatin
g hy
perli
nks
–em
bedd
ing
obje
cts
like
grap
hics
–de
scrib
ing
tabl
es
–...
Cod
ing:
–H
TM
L D
ocum
ents
are
usu
ally
sto
red
as te
xt fi
les
Hyp
erm
edia
sys
tem
s th
at m
ake
use
of H
TM
L u
se th
e H
yper
text
Tra
nsfe
rPr
otoc
ol (
HT
TP
) fo
r ob
ject
ret
riev
al. T
he s
et o
f ad
dres
sabl
e in
form
atio
n ob
ject
sin
the
inte
rnet
is d
enot
ed a
s th
e W
orld
Wid
e W
eb (
WW
W).
12.5
Hyp
erte
xt M
arku
p L
angu
age
(HT
ML
)
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
16 /
2612
.5 H
yper
text
Mar
kup
Lan
guag
e / S
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Bold text
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Paragraph
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12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
17 /
2612
.5 H
yper
text
Mar
kup
Lan
guag
e / H
yper
links
Lin
ks to
oth
er d
ocum
ents
:C
lick
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wee
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e an
chor
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tart
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xpec
ted
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e th
e so
urce
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he
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. The
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tinat
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escr
ibed
by
the
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ibut
e of
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g.
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ed w
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nk, t
o de
fine
them
as
a lin
k de
stin
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n:<
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AM
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g“>
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rest
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rma
tion
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is is
my
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rest
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12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
18 /
2612
.5 H
yper
text
Mar
kup
Lan
guag
e / H
yper
links
Sour
ce d
ocum
ent
Pars
er
From
atte
r
Tar
get d
ocum
ent
SGM
LR
ules
Doc
umen
tty
pe
Sem
antic
s of
Attr
ibut
es
Bas
ic d
efin
itio
n of
HT
ML
sup
port
s on
ly th
e re
pres
enta
tion
of
hype
rtex
t doc
umen
tsN
umer
ous
prop
riet
ary
exte
nsio
ns e
xist
(e.
g. d
efin
ed b
y N
etsc
ape
and
Mic
roso
ft)
that
mov
e H
TM
L to
mor
ein
tera
ctiv
e do
cum
ents
and
hyp
erm
edia
Dra
wba
ck: d
ocum
ents
that
use
ext
ensi
ons
are
tail
ored
to p
arti
cula
r br
owse
rs
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
19 /
2612
.6 M
ultim
edia
and
Hyp
erm
edia
Inf
orm
atio
n C
odin
g E
xper
t Gro
up (
MH
EG
)
Exc
hang
e fo
rmat
and
rep
rese
ntat
ion
for
com
pose
d (t
ime-
depe
nden
t) m
ultim
edia
info
rmat
ion
Prov
ides
str
uctu
res
for:
– in
tera
ctiv
e, s
patia
l and
tem
pora
l rel
ated
info
rmat
ion
(AS
N.1
= A
bstr
act S
ynta
x N
otat
ion
One
)
Fina
l for
m f
orm
at:
–th
e st
ruct
ure
of th
e co
ded
docu
men
ts is
fixe
d af
ter
form
attin
g (c
odin
g th
roug
h B
ER
.1 =
Bas
ic E
ncod
ing
Rul
es)
Suita
ble
for:
– r
eal-t
ime
(dis
trib
uted
) m
ultim
edia
/hyp
erm
edia
app
licat
ions
(no
com
plex
par
sing
and
inte
rpre
tatio
n re
quire
d)
Typ
ical
app
licat
ion:
–de
vice
s w
ith s
mal
l res
ourc
es li
ke p
oint
-of-
sale
s te
rmin
als,
vid
eo o
n de
man
d se
t-to
pbo
xes
...
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
20 /
2612
.6 M
HE
G /
Stan
dard
isat
ion
MH
EG
Wor
k w
ithin
ISO
/IE
C J
TC
1/SC
29/W
G12
(ISO
IS
/DIS
/CD
135
22-X
)
Part
1: M
HE
G O
bjec
t Rep
rese
ntat
ion,
Bas
e N
otat
ion
(ASN
.1)
Part
2: M
HE
G A
ltern
ate
Not
atio
n (S
GM
L)
(sk
ippe
d!)
Part
3: M
HE
G E
xten
sion
for
Scr
iptin
g L
angu
age
Supp
ort
Part
4: R
egis
trat
ion
Pro
cedu
res
for
Form
at I
dent
ifie
rs
Part
5: M
HE
G S
ubse
t for
Bas
e L
evel
Im
plem
enta
tion
Part
6: S
uppo
rt f
or E
nhan
ced
Inte
ract
ive
App
licat
ions
MH
EG
WG
1 :
JPE
GW
G11
: MPE
G
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
21 /
26
MH
EG
For
mat
ter
MH
EG
Eng
ine
MH
EG
Obj
ect
Stor
age
info
rmat
ion
inpu
t(e
.g. w
eb o
f hy
perm
edia
- do
cum
ents
, ...
)
MH
EG
Par
ser
MH
EG
Eng
ine
MH
EG
Obj
ect
Stor
age
Obj
ect
Tra
nsfe
r
Obj
ect
Req
uest
inte
ract
ive
pres
enta
tion
12.6
MH
EG
/ E
xam
ple
App
licat
ion
MH
EG
Sta
ndar
d:–
data
str
uctu
res
and
bina
ry r
epre
sent
atio
n of
MH
EG
Obj
ects
(no
t: re
trie
val
prot
ocol
or
MH
EG
Eng
ine)
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
22 /
2612
.6 M
HE
G /
Obj
ect C
lass
es
MH
EG
obj
ects
are
a c
ompo
sitio
n of
a s
et o
f ob
ject
s de
fini
ng–
con
ten
ts (
Co
nte
nt
Cla
ss),
–U
ser
Inte
ract
ion
(In
tera
ctio
n C
lass
) p
rese
nta
tion
att
rib
ute
s (B
eha
viou
r C
lass
)
–an
d o
the
rs.
Inst
ance
s ca
n be
cre
ated
from
all
leav
esof
thi
s M
HE
G c
lass
hie
rarc
hy t
ree.
Inst
an
ces
can
not
be
cre
ate
d f
rom
inte
rna
l no
des
of t
he t
ree
.
MH
Obj
ect
Beh
avio
urD
escr
ipto
rC
ompo
nent
Mac
ro
Act
ion
Lin
kSc
ript
Con
tent
Inte
ract
ion
Com
posi
te
Sele
ctio
nM
odif
icat
ion
e.g
. “p
ush
Sto
p b
utto
n“ e
.g.
“edi
t a
data
inpu
t fil
e“
e.g.
gra
phic
s, te
xt,
...e.
g. “
star
t“
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
23 /
2612
.6 M
HE
G /
Obj
ects
Exa
mpl
es
Com
plex
MH
EG
Obj
ects
incl
ude
seve
ral o
ther
MH
EG
obj
ects
that
det
erm
ine:
–th
e co
nten
t (ou
tput
obj
ects
)–
the
user
inte
ract
ion
(inpu
t obj
ects
)–
the
pres
enta
tion
(act
ion
obje
cts)
–th
e re
latio
ns b
etw
een
the
diffe
rent
obj
ects
(lin
k ob
ject
s)
Inpu
t Obj
ects
(use
r In
tera
ctio
n)B
utto
n A
(st
art)
But
ton
B (
stop
)
Slid
er A
(Vol
ume)
Men
u A
(Con
trol
)
Out
put O
bjec
ts
Pict
ure
A(e
.g. J
PEG
)
Vid
eo 1
(e.g
. MPE
G)
Tex
t A
Tex
t B
Act
ion
Obj
ects
Act
ion
1V
olum
e =
50%
Act
ion
2
Pos.
= (
100,
200)
Act
ion
3
Pos.
= (
250,
100)
Lin
k O
bjec
ts
LIN
K A
ctio
n 1
TO
Vid
eo 1
LIN
K A
ctio
n 2
TO
Pic
ture
A
Act
ion
3ST
AR
T
Act
ion
4ST
AR
T S
crip
t 1
LIN
K A
ctio
n 3
TO
But
ton
A
IF B
utto
n A
=C
LIC
KE
D
LIN
K A
ctio
n 3
TO
Vid
eo 1
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
24 /
2612
.6 M
HE
G /
Pres
enta
ble
Obj
ect E
xam
ple
Stru
ctur
al in
form
atio
n in
clud
ed in
MH
EG
obj
ects
allo
ws
to d
eter
min
e th
epr
esen
tati
on o
f th
e ob
ject
MH
EG
Hyp
erm
edia
Obj
ect
Pres
enta
tion
Vid
eo
star
tst
op
Vid
eo 1
(e.g
. MPE
G)
But
ton
A (
star
t)
But
ton
B (
stop
)T
ext A
Act
ion
1
Po
s.=
(10
0,20
0)
Act
ion
2
Po
s.=
(10
0,18
0)
IF B
utto
n A
=C
LIC
KE
D
LIN
K A
ctio
n 3
TO
Vid
eo 1
LIN
K A
ctio
n 1
TO
Vid
eo 1
pres
enta
tion
as d
escr
ibed
by
the
incl
uded
set
of
link,
act
ion
and
scri
pt o
bjec
ts
exte
rnal
ref
eren
ces
MH
EG
Obj
ects
may
be
dist
ribu
ted
MH
EG
Obj
ects
MH
EG
Obj
ects
MH
EG
Obj
ects
MH
EG
Obj
ects
Tex
t A
Act
ion
3...
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
25 /
2612
.6 M
HE
G /
Sche
dulin
g of
Obj
ects
MH
EG
sup
port
s re
al-t
ime
hype
rmed
ia p
rese
ntat
ions
by
allo
win
g to
add
tim
e de
pend
ent
obje
ct p
repa
ratio
n an
d pr
esen
tatio
n at
trib
utes
(tim
e st
amps
)
The
PR
EPA
RE
act
ion
trig
gers
the
retr
ieva
l and
initi
alis
atio
n of
the
MH
EG
obj
ect.
Prob
lem
: del
ays
cann
ot b
e ex
actly
pre
dict
ed b
y th
e M
HE
G e
ngin
e.
Vid
eo Au
dio Tex
t A
Tex
t B
Sec.
05
1015
2025
prep
are
audi
opr
epar
e te
xt A
prep
are
text
Bti
mes
tam
ps a
nd a
ctio
ns s
tore
d in
the
MH
EG
-Obj
ect
Pre
sent
atio
n
12. H
yper
med
ia a
nd D
ocum
ents
Multimedia Kommunikation SS‘99
26 /
2612
.6 M
HE
G /
Con
clus
ions
Com
plex
str
uctu
res:
–M
HE
G E
ngin
e im
plem
enta
tion
beco
mes
diff
icul
t
Rel
atio
n to
”sc
ript o
nly
appr
oach
es”
or ”
virt
ual m
achi
nes
(JA
VA
)” n
ot c
lear
MH
EG
En
gine
nee
ds s
mal
l mem
ory
reso
urce
s ?
Set
of s
tand
ards
is g
row
ing