<s>
The	O
region	B-Application
connection	I-Application
calculus	I-Application
(	O
RCC	O
)	O
is	O
intended	O
to	O
serve	O
for	O
qualitative	O
spatial	O
representation	O
and	O
reasoning	O
.	O
</s>
<s>
RCC8	B-Application
consists	O
of	O
8	O
basic	O
relations	O
that	O
are	O
possible	O
between	O
two	O
regions	O
:	O
</s>
<s>
The	O
composition	O
table	O
of	O
RCC8	B-Application
are	O
as	O
follows	O
:	O
</s>
<s>
The	O
RCC8	B-Application
calculus	O
is	O
intended	O
for	O
reasoning	O
about	O
spatial	O
configurations	O
.	O
</s>
<s>
The	O
spatial	O
configuration	O
can	O
be	O
formalized	O
in	O
RCC8	B-Application
as	O
the	O
following	O
constraint	O
network	O
:	O
</s>
<s>
Using	O
the	O
RCC8	B-Application
composition	O
table	O
and	O
the	O
path-consistency	O
algorithm	O
,	O
we	O
can	O
refine	O
the	O
network	O
in	O
the	O
following	O
way	O
:	O
</s>
<s>
That	O
is	O
,	O
the	O
road	O
either	O
overlaps	O
(	O
PO	O
)	O
property2	O
,	O
or	O
is	O
a	O
tangential	B-Application
proper	I-Application
part	I-Application
of	O
it	O
.	O
</s>
<s>
But	O
,	O
if	O
the	O
road	O
is	O
a	O
tangential	B-Application
proper	I-Application
part	I-Application
of	O
property2	O
,	O
then	O
the	O
road	O
can	O
only	O
be	O
externally	O
connected	O
(	O
EC	O
)	O
to	O
property1	O
.	O
</s>
<s>
Other	O
versions	O
of	O
the	O
region	B-Application
connection	I-Application
calculus	I-Application
include	O
RCC5	O
(	O
with	O
only	O
five	O
basic	O
relations	O
-	O
the	O
distinction	O
whether	O
two	O
regions	O
touch	O
each	O
other	O
are	O
ignored	O
)	O
and	O
RCC23	O
(	O
which	O
allows	O
reasoning	O
about	O
convexity	O
)	O
.	O
</s>
<s>
RCC8	B-Application
has	O
been	O
partially	O
implemented	O
in	O
GeoSPARQL	B-General_Concept
as	O
described	O
below	O
:	O
</s>
