<s>
ArcObjects	B-General_Concept
is	O
a	O
development	O
environment	O
of	O
the	O
ArcGIS	B-Application
family	O
of	O
applications	O
.	O
</s>
<s>
Using	O
Visual	B-Language
Basic	I-Language
for	I-Language
Applications	I-Language
,	O
C#	B-Application
or	O
Java	B-Language
SDK	O
for	O
ArcGIS	B-Application
,	O
it	O
allows	O
developers	O
to	O
extend	O
these	O
applications.ArcObjects	O
is	O
a	O
library	O
of	O
COM	O
components	O
that	O
build	O
up	O
the	O
foundation	O
of	O
the	O
Esri	O
's	O
ArcGIS	B-Application
platform	O
.	O
</s>
<s>
ArcObjects	B-General_Concept
is	O
written	O
mostly	O
in	O
the	O
C++	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
All	O
of	O
the	O
ArcGIS	B-Application
for	O
Desktop	O
applications	O
are	O
based	O
on	O
ArcObjects	B-General_Concept
.	O
</s>
<s>
Since	O
ArcGIS	B-Application
is	O
completely	O
built	O
on	O
top	O
of	O
ArcObjects	B-General_Concept
,	O
the	O
ArcGIS	B-Application
platform	O
can	O
be	O
fully	O
customized	O
and	O
extended	O
by	O
making	O
use	O
of	O
its	O
COM	O
services	O
and	O
capabilities	O
.	O
</s>
<s>
This	O
allows	O
for	O
easy	O
extension	O
of	O
the	O
ArcObjects	B-General_Concept
data	O
model	O
with	O
virtually	O
any	O
programming	O
language	O
that	O
is	O
compatible	O
with	O
COM	O
,	O
such	O
as	O
Visual	B-Language
Basic	I-Language
,	O
C#	B-Application
,	O
Visual	B-Language
Basic.NET	I-Language
,	O
Java	B-Language
and	O
Python	B-Language
.	O
</s>
<s>
In	O
other	O
words	O
,	O
developers	O
do	O
not	O
require	O
access	O
to	O
the	O
source	O
code	O
of	O
ArcObjects	B-General_Concept
in	O
order	O
to	O
extend	O
the	O
ArcGIS	B-Application
platform	O
.	O
</s>
<s>
For	O
this	O
reason	O
,	O
an	O
ArcObjects	B-General_Concept
programmer	O
can	O
make	O
use	O
of	O
any	O
type	O
inside	O
the	O
ArcObjects	B-General_Concept
system	O
without	O
knowing	O
the	O
implementation	O
details	O
of	O
the	O
type	O
,	O
only	O
needing	O
to	O
know	O
what	O
the	O
type	O
is	O
able	O
to	O
do	O
.	O
</s>
<s>
The	O
ArcObjects	B-General_Concept
data	O
model	O
is	O
based	O
on	O
the	O
COM	O
standard	O
,	O
which	O
makes	O
it	O
compatible	O
with	O
other	O
COM	O
objects	O
and	O
applications	O
.	O
</s>
<s>
The	O
ArcGIS	B-Application
platform	O
was	O
built	O
using	O
ArcObjects	B-General_Concept
types	O
,	O
such	O
as	O
classes	O
,	O
interfaces	O
,	O
and	O
enumerations	O
.	O
</s>
<s>
ArcObjects	B-General_Concept
use	O
COM	O
interfaces	O
to	O
organize	O
and	O
communicate	O
properties	O
and	O
methods	O
of	O
its	O
classes	O
,	O
ensuring	O
compatibility	O
with	O
other	O
COM-based	O
objects	O
and	O
systems	O
.	O
</s>
<s>
When	O
working	O
with	O
an	O
ArcObjects	B-General_Concept
COM	O
class	O
,	O
its	O
properties	O
and	O
methods	O
are	O
accessed	O
solely	O
through	O
one	O
of	O
its	O
implemented	O
interfaces	O
via	O
the	O
process	O
of	O
Query	O
Interface	O
(	O
QI	O
)	O
.	O
</s>
<s>
Multiple	O
interfaces	O
are	O
commonly	O
available	O
for	O
classes	O
in	O
ArcObjects	B-General_Concept
.	O
</s>
<s>
Although	O
only	O
one	O
interface	O
can	O
be	O
used	O
when	O
instantiating	O
an	O
object	O
,	O
multiple	O
interfaces	O
are	O
often	O
available	O
for	O
classes	O
in	O
ArcObjects	B-General_Concept
,	O
allowing	O
for	O
greater	O
flexibility	O
and	O
compatibility	O
with	O
other	O
systems	O
based	O
on	O
the	O
COM	O
standard	O
.	O
</s>
