<s>
Sones	B-Application
GraphDB	I-Application
was	O
a	O
graph	B-Application
database	I-Application
developed	O
by	O
the	O
German	O
company	O
sones	O
GmbH	O
,	O
available	O
from	O
2010	O
to	O
2012	O
.	O
</s>
<s>
GraphDB	B-Application
was	O
unique	O
in	O
that	O
its	O
design	O
based	O
on	O
weighted	O
graphs	O
.	O
</s>
<s>
GraphDB	B-Application
was	O
developed	O
in	O
the	O
programming	O
language	O
C#	B-Application
and	O
ran	O
on	O
Microsoft	B-Application
's	I-Application
.NET	I-Application
Framework	I-Application
and	O
on	O
the	O
open	O
source	O
reimplementation	O
Mono	B-Application
.	O
</s>
<s>
GraphDB	B-Application
was	O
available	O
as	O
software	B-Architecture
as	I-Architecture
a	I-Architecture
service	I-Architecture
(	O
SaaS	B-Architecture
)	O
on	O
the	O
Microsoft	O
cloud	O
Azure	B-Application
Services	I-Application
Platform	I-Application
.	O
</s>
<s>
GraphDB	B-Application
was	O
also	O
a	O
component	O
of	O
an	O
open	O
source	O
solution	B-Application
stack	I-Application
.	O
</s>
<s>
In	O
2014	O
the	O
trademark	O
"	O
GraphDB	B-Application
"	O
was	O
acquired	O
by	O
Ontotext	O
.	O
</s>
<s>
OWLIM	O
,	O
Ontotext	O
's	O
graph	B-Application
database	I-Application
and	O
RDF	O
triplestore	O
,	O
was	O
renamed	O
GraphDB	B-Application
.	O
</s>
<s>
GraphDB	B-Application
had	O
index-free	O
adjacency	O
,	O
which	O
meant	O
that	O
it	O
not	O
necessary	O
to	O
manage	O
a	O
global	O
index	O
for	O
relationships	O
between	O
nodes/entities	O
.	O
</s>
<s>
The	O
sones	O
graph	B-Application
database	I-Application
was	O
able	O
to	O
store	O
and	O
retrieve	O
unstructured	O
properties	O
in	O
any	O
node	O
of	O
the	O
graph	O
.	O
</s>
<s>
GraphDB	B-Application
used	O
its	O
own	O
query	O
language	O
,	O
GraphQL	O
,	O
which	O
was	O
similar	O
to	O
SQL	O
.	O
</s>
<s>
GraphDB	B-Application
used	O
an	O
object-oriented	B-Language
concept	O
,	O
which	O
enabled	O
better	O
integration	O
into	O
object-oriented	B-Language
programming	I-Language
languages	I-Language
.	O
</s>
<s>
In	O
addition	O
to	O
providing	O
a	O
number	O
of	O
interfaces	O
(	O
e.g.	O
,	O
Java	B-Language
,	O
C#	B-Application
,	O
WebShell	O
,	O
WebDAV	B-Protocol
)	O
the	O
sones	O
graph	B-Application
database	I-Application
also	O
offers	O
a	O
REST	O
API	O
.	O
</s>
<s>
GraphDB	B-Application
has	O
a	O
modular	O
structure	O
consisting	O
of	O
4	O
application	O
layers	O
.	O
</s>
<s>
The	O
actual	O
graph-oriented	O
database	O
logic	O
as	O
well	O
as	O
all	O
functionalities	O
specific	O
to	O
the	O
database	O
are	O
implemented	O
in	O
the	O
GraphDB	B-Application
.	O
</s>
