<s>
Well-known	B-Language
text	I-Language
(	O
WKT	O
)	O
is	O
a	O
text	O
markup	O
language	O
for	O
representing	O
vector	O
geometry	O
objects	O
.	O
</s>
<s>
A	O
binary	O
equivalent	O
,	O
known	O
as	O
well-known	B-Language
binary	I-Language
(	O
WKB	O
)	O
,	O
is	O
used	O
to	O
transfer	O
and	O
store	O
the	O
same	O
information	O
in	O
a	O
more	O
compact	O
form	O
convenient	O
for	O
computer	O
processing	O
but	O
that	O
is	O
not	O
human-readable	O
.	O
</s>
<s>
For	O
example	O
,	O
PostGIS	B-Application
contains	O
functions	O
that	O
can	O
convert	O
geometries	O
to	O
and	O
from	O
a	O
WKT	O
representation	O
,	O
making	O
them	O
human	O
readable	O
.	O
</s>
<s>
The	O
OGC	O
standard	O
definition	O
requires	O
a	O
polygon	B-General_Concept
to	O
be	O
topologically	O
closed	O
.	O
</s>
<s>
It	O
also	O
states	O
that	O
if	O
the	O
exterior	O
linear	O
ring	O
of	O
a	O
polygon	B-General_Concept
is	O
defined	O
in	O
a	O
counterclockwise	O
direction	O
,	O
then	O
it	O
will	O
be	O
seen	O
from	O
the	O
"	O
top	O
"	O
.	O
</s>
<s>
Well-known	B-Language
binary	I-Language
(	O
WKB	O
)	O
representations	O
are	O
typically	O
shown	O
in	O
hexadecimal	O
strings	O
.	O
</s>
<s>
The	O
first	O
byte	B-Application
indicates	O
the	O
byte	B-Application
order	O
for	O
the	O
data	O
:	O
</s>
<s>
The	O
next	O
4	O
bytes	B-Application
are	O
a	O
32-bit	O
unsigned	O
integer	O
for	O
the	O
geometry	O
type	O
,	O
as	O
described	O
below	O
:	O
</s>
<s>
EWKT	B-Language
and	O
EWKB	B-Language
–	O
Extended	O
Well-Known	O
Text/Binary	O
A	O
PostGIS-specific	O
format	O
that	O
includes	O
the	O
spatial	O
reference	O
system	O
identifier	O
(	O
SRID	O
)	O
and	O
up	O
to	O
4	O
ordinate	O
values	O
(	O
XYZM	O
)	O
.	O
</s>
<s>
AGF	B-Language
Text	I-Language
–	O
Autodesk	B-Language
Geometry	I-Language
Format	I-Language
An	O
extension	O
to	O
OGC	O
's	O
Standard	O
(	O
at	O
the	O
time	O
)	O
,	O
to	O
include	O
curved	O
elements	O
;	O
most	O
notably	O
used	O
in	O
MapGuide	B-Application
.	O
</s>
