<s>
TYPO3	B-Protocol
is	O
a	O
free	B-Application
and	O
open-source	B-Application
Web	O
content	B-Protocol
management	I-Protocol
system	I-Protocol
written	O
in	O
PHP	B-Application
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
It	O
can	O
run	O
on	O
a	O
variety	O
of	O
web	B-Application
servers	I-Application
,	O
such	O
as	O
Apache	B-Application
,	O
Nginx	B-Operating_System
or	O
IIS	B-Application
,	O
and	O
on	O
top	O
of	O
many	O
operating	O
systems	O
,	O
including	O
Linux	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
,	O
FreeBSD	B-Operating_System
,	O
macOS	B-Application
and	O
OS/2	B-Application
.	O
</s>
<s>
TYPO3	B-Protocol
is	O
similar	O
to	O
other	O
popular	O
content	B-Protocol
management	I-Protocol
systems	I-Protocol
such	O
as	O
,	O
Drupal	B-Application
,	O
Joomla	B-Protocol
!	I-Protocol
</s>
<s>
and	O
WordPress	B-Application
.	O
</s>
<s>
TYPO3	B-Protocol
is	O
credited	O
to	O
be	O
highly	O
flexible	O
,	O
as	O
code	O
and	O
content	O
are	O
run	O
separately	O
.	O
</s>
<s>
TYPO3	B-Protocol
supports	O
publishing	O
content	O
in	O
multiple	O
languages	O
due	O
to	O
its	O
built-in	O
localization	B-General_Concept
system	O
.	O
</s>
<s>
Due	O
to	O
its	O
features	O
like	O
editorial	O
workplace	O
and	O
workflow	O
,	O
advanced	O
frontend	O
editing	O
,	O
scalability	O
and	O
maturity	O
,	O
TYPO3	B-Protocol
classifies	O
itself	O
as	O
an	O
enterprise	O
level	O
content	B-Protocol
management	I-Protocol
system	I-Protocol
.	O
</s>
<s>
TYPO3	B-Protocol
was	O
initially	O
authored	O
by	O
the	O
Dane	O
Kasper	B-Protocol
Skårhøj	I-Protocol
in	O
1997	O
.	O
</s>
<s>
Calculations	O
from	O
the	O
TYPO3	B-Protocol
Association	O
show	O
that	O
it	O
is	O
currently	O
used	O
in	O
more	O
than	O
500,000	O
installations	O
.	O
</s>
<s>
TYPO3	B-Protocol
provides	O
a	O
base	O
set	O
of	O
interfaces	O
,	O
functions	O
and	O
modules	O
.	O
</s>
<s>
More	O
than	O
5000	O
extensions	O
are	O
currently	O
available	O
for	O
TYPO3	B-Protocol
for	O
download	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
from	O
a	O
repository	O
called	O
the	O
TYPO3	B-Protocol
Extension	O
Repository	O
,	O
or	O
TER	O
.	O
</s>
<s>
TYPO3	B-Protocol
can	O
run	O
on	O
most	O
HTTP	B-Application
servers	I-Application
such	O
as	O
Apache	B-Application
,	O
Nginx	B-Operating_System
or	O
IIS	B-Application
on	O
top	O
of	O
Linux	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
or	O
macOS	B-Application
.	O
</s>
<s>
It	O
uses	O
PHP	B-Application
7.2	O
or	O
newer	O
and	O
any	O
relational	O
database	O
supported	O
by	O
the	O
TYPO3	B-Protocol
DBAL	B-Application
including	O
MySQL	B-Application
,	O
MariaDB	B-Application
,	O
PostgreSQL	B-Application
,	O
and	O
SQLite	B-Language
.	O
</s>
<s>
Some	O
3rd-party	O
extensions	O
not	O
using	O
the	O
database	O
API	O
support	O
MySQL	B-Application
as	O
the	O
only	O
database	O
engine	O
.	O
</s>
<s>
The	O
system	O
can	O
be	O
run	O
on	O
any	O
web	B-Application
server	I-Application
with	O
at	O
least	O
256	O
MB	O
RAM	B-Architecture
and	O
a	O
CPU	B-General_Concept
appropriate	O
for	O
that	O
RAM	B-Architecture
.	O
</s>
<s>
The	O
backend	O
can	O
be	O
displayed	O
in	O
any	O
modern	O
browser	O
with	O
JavaScript	B-Language
.	O
</s>
<s>
There	O
is	O
no	O
browser	O
restriction	O
for	O
displaying	O
user-oriented	O
content	O
generated	O
by	O
TYPO3	B-Protocol
.	O
</s>
<s>
Since	O
version	O
4.5	O
,	O
TYPO3	B-Protocol
is	O
published	O
with	O
a	O
demo	O
website	O
called	O
"	O
Introduction	O
Package	O
"	O
.	O
</s>
<s>
Building	O
basic	O
proficiency	O
in	O
TYPO3	B-Protocol
needs	O
between	O
a	O
few	O
weeks	O
up	O
to	O
some	O
months	O
.	O
</s>
<s>
For	O
an	O
author	O
or	O
editor	O
who	O
administers	O
and	O
operates	O
a	O
TYPO3	B-Protocol
based	O
website	O
,	O
this	O
requirement	O
can	O
range	O
from	O
a	O
few	O
minutes	O
to	O
a	O
few	O
hours	O
.	O
</s>
<s>
A	O
developer	O
setting	O
up	O
a	O
website	O
with	O
TYPO3	B-Protocol
would	O
need	O
to	O
work	O
intensively	O
with	O
the	O
meta-language	O
TypoScript	B-Protocol
.	O
</s>
<s>
Conceptually	O
,	O
TYPO3	B-Protocol
consists	O
of	O
two	O
parts	O
:	O
the	O
frontend	O
,	O
visible	O
to	O
visitors	O
,	O
and	O
the	O
administrative	O
backend	O
.	O
</s>
<s>
The	O
core	O
functions	O
of	O
TYPO3	B-Protocol
include	O
user	O
privileges	O
and	O
user	O
roles	O
,	O
timed	O
display	O
control	O
of	O
content	O
(	O
show/hide	O
content	O
elements	O
)	O
,	O
a	O
search	O
function	O
for	O
static	O
and	O
dynamic	O
content	O
,	O
search-engine	O
friendly	O
URLs	O
,	O
an	O
automatic	O
sitemap	O
,	O
multi-language	O
capability	O
for	O
frontend	O
and	O
backend	O
,	O
and	O
more	O
.	O
</s>
<s>
Like	O
most	O
modern	O
CMSes	B-Protocol
,	O
TYPO3	B-Protocol
follows	O
the	O
policy	O
of	O
separation	O
of	O
content	O
and	O
layout	O
:	O
The	O
website	O
content	O
is	O
stored	O
in	O
a	O
relational	O
database	O
,	O
while	O
the	O
page	O
templates	O
are	O
stored	O
on	O
the	O
file	O
system	O
.	O
</s>
<s>
TYPO3	B-Protocol
defines	O
various	O
basic	O
types	O
of	O
content	O
data	O
.	O
</s>
<s>
Internally	O
,	O
TYPO3	B-Protocol
is	O
managed	O
by	O
various	O
PHP	B-Application
arrays	O
.	O
</s>
<s>
This	O
is	O
achieved	O
by	O
a	O
unique	O
configuration	O
language	O
called	O
TypoScript	B-Protocol
.	O
</s>
<s>
Designing	O
and	O
developing	O
with	O
TYPO3	B-Protocol
is	O
commonly	O
based	O
on	O
the	O
following	O
elements	O
,	O
among	O
others	O
:	O
</s>
<s>
Since	O
TYPO3	B-Protocol
6	O
,	O
the	O
system	O
runs	O
on	O
the	O
templating	O
engine	O
Fluid	O
.	O
</s>
<s>
It	O
can	O
be	O
extended	O
by	O
custom	O
view	O
helpers	O
written	O
in	O
PHP	B-Application
.	O
</s>
<s>
TypoScript	B-Protocol
is	O
a	O
purely	O
declarative	O
configuration	O
language	O
.	O
</s>
<s>
In	O
Typoscript	B-Protocol
,	O
configuration	O
values	O
are	O
defined	O
,	O
which	O
are	O
parsed	O
into	O
a	O
system-wide	O
PHP	B-Application
array	O
.	O
</s>
<s>
TypoScript	B-Protocol
is	O
object-based	O
and	O
organized	O
in	O
a	O
tree-like	O
structure	O
.	O
</s>
<s>
As	O
TYPO3	B-Protocol
CMS	I-Protocol
is	O
written	O
in	O
PHP	B-Application
,	O
therefore	O
most	O
features	O
can	O
be	O
modified	O
or	O
extended	O
by	O
experienced	O
users	O
.	O
</s>
<s>
Extensions	O
are	O
the	O
cornerstone	O
in	O
the	O
internal	O
architecture	O
of	O
TYPO3	B-Protocol
.	O
</s>
<s>
A	O
feature	O
that	O
was	O
introduced	O
with	O
version	O
3.5	O
in	O
2003	O
is	O
the	O
Extension	O
Manager	O
,	O
a	O
control	O
center	O
managing	O
all	O
TYPO3	B-Protocol
extensions	O
.	O
</s>
<s>
The	O
division	O
between	O
the	O
TYPO3	B-Protocol
core	O
and	O
the	O
extensions	O
is	O
an	O
important	O
concept	O
which	O
determined	O
the	O
development	O
of	O
TYPO3	B-Protocol
in	O
the	O
past	O
years	O
.	O
</s>
<s>
This	O
means	O
that	O
a	O
TYPO3	B-Protocol
system	O
will	O
appear	O
as	O
a	O
unit	O
while	O
actually	O
being	O
composed	O
of	O
the	O
core	O
application	O
and	O
a	O
set	O
of	O
extensions	O
providing	O
various	O
features	O
.	O
</s>
<s>
Generally	O
,	O
extensions	O
are	O
written	O
in	O
PHP	B-Application
.	O
</s>
<s>
The	O
full	O
command	O
set	O
of	O
PHP	B-Application
5.3	O
can	O
be	O
used	O
(	O
regarded	O
the	O
system	O
requirements	O
of	O
the	O
specific	O
TYPO3	B-Protocol
version	O
)	O
,	O
but	O
TYPO3	B-Protocol
also	O
provides	O
several	O
library	O
classes	O
for	O
better	O
efficiency	O
:	O
Best	O
known	O
and	O
most	O
used	O
is	O
the	O
piBase	O
library	O
class	O
.	O
</s>
<s>
With	O
introduction	O
of	O
TYPO3	B-Protocol
4.3	O
in	O
2009	O
,	O
piBase	O
has	O
been	O
replaced	O
(	O
or	O
extended	O
)	O
by	O
the	O
Extbase	O
library	O
,	O
which	O
is	O
a	O
modern	O
,	O
MVC-based	O
development	O
framework	O
.	O
</s>
<s>
To	O
ensure	O
backwards	O
compatibility	O
,	O
both	O
libraries	O
can	O
be	O
used	O
in	O
the	O
same	O
TYPO3	B-Protocol
installation	O
.	O
</s>
<s>
Extbase	O
itself	O
is	O
a	O
backport	O
of	O
some	O
features	O
of	O
FLOW3	B-Language
,	O
a	O
general	O
web	O
application	O
framework	O
.	O
</s>
<s>
As	O
it	O
classifies	O
as	O
an	O
enterprise	O
CMS	O
,	O
many	O
global	O
companies	O
and	O
organisations	O
base	O
their	O
web	O
or	O
intranet	O
sites	O
on	O
TYPO3	B-Protocol
.	O
</s>
<s>
International	O
organisations	O
running	O
one	O
or	O
more	O
TYPO3	B-Protocol
sites	O
are	O
:	O
Airbus	O
,	O
Konica-Minolta	O
,	O
Leica	O
Microsystems	O
,	O
Air	O
France	O
,	O
Greenpeace	O
and	O
Meda	O
(	O
Sweden	O
)	O
.	O
</s>
<s>
October	O
2012typo3.org	O
:	O
A	O
Brief	O
Introduction	O
to	O
TYPO3	B-Protocol
version	O
4.6	O
24	O
April	O
2012	O
Complete	O
Accessibility	O
for	O
new	O
installations	O
acc	O
.	O
</s>
<s>
Access	O
flexform	O
values	O
by	O
TypoScript	B-Protocol
.	O
</s>
<s>
A	O
completely	O
rewritten	O
version	O
(	O
code-named	O
"	O
Phoenix	O
"	O
)	O
was	O
originally	O
planned	O
as	O
TYPO3	B-Protocol
version	O
5.0	O
.	O
</s>
<s>
While	O
working	O
on	O
this	O
new	O
release	O
and	O
analyzing	O
the	O
10-year	O
history	O
and	O
complexity	O
of	O
TYPO3	B-Protocol
v4	O
,	O
the	O
TYPO3	B-Protocol
community	O
decided	O
to	O
branch	O
out	O
version	O
5	O
as	O
a	O
completely	O
separate	O
product	O
,	O
one	O
that	O
would	O
n't	O
replace	O
version	O
4	O
in	O
the	O
near	O
future	O
and	O
as	O
such	O
needed	O
to	O
have	O
its	O
own	O
name	O
.	O
</s>
<s>
Published	O
as	O
FLOW3	B-Language
,	O
it	O
along	O
with	O
various	O
other	O
packages	O
then	O
served	O
as	O
the	O
basis	O
for	O
the	O
start	O
of	O
development	O
of	O
project	O
Phoenix	O
.	O
</s>
<s>
In	O
September	O
2012	O
,	O
the	O
TYPO3	B-Protocol
developers	O
decided	O
on	O
the	O
name	O
for	O
the	O
new	O
product	O
,	O
"	O
TYPO3	B-Protocol
Neos	O
"	O
.	O
</s>
<s>
With	O
TYPO3	B-Protocol
Neos	O
1.0	O
alpha1	O
,	O
a	O
public	O
test	O
version	O
was	O
released	O
in	O
late	O
2012	O
.	O
</s>
<s>
In	O
May	O
2015	O
the	O
TYPO3	B-Protocol
Association	O
and	O
the	O
Neos	O
team	O
decided	O
to	O
go	O
separate	O
ways	O
,	O
with	O
TYPO3	B-Protocol
CMS	I-Protocol
remaining	O
the	O
only	O
CMS	O
product	O
endorsed	O
by	O
the	O
Association	O
and	O
the	O
Neos	O
team	O
publishing	O
Neos	O
as	O
a	O
stand-alone	O
CMS	O
without	O
any	O
connection	O
to	O
the	O
TYPO3	B-Protocol
world	O
.	O
</s>
