<s>
eXist-db	O
(	O
or	O
eXist	O
for	O
short	O
)	O
is	O
an	O
open	B-Application
source	I-Application
software	I-Application
project	O
for	O
NoSQL	B-General_Concept
databases	B-Application
built	O
on	O
XML	B-Protocol
technology	O
.	O
</s>
<s>
It	O
is	O
classified	O
as	O
both	O
a	O
NoSQL	B-General_Concept
document-oriented	B-General_Concept
database	I-General_Concept
system	O
and	O
a	O
native	B-Application
XML	I-Application
database	I-Application
(	O
and	O
it	O
provides	O
support	O
for	O
XML	B-Protocol
,	O
JSON	B-General_Concept
,	O
HTML	B-Language
and	O
Binary	O
documents	O
)	O
.	O
</s>
<s>
Unlike	O
most	O
relational	B-Application
database	I-Application
management	I-Application
systems	I-Application
(	O
RDBMS	O
)	O
and	O
NoSQL	B-General_Concept
databases	B-Application
,	O
eXist-db	O
provides	O
XQuery	B-Language
and	O
XSLT	B-Application
as	O
its	O
query	O
and	O
application	O
programming	O
languages	O
.	O
</s>
<s>
eXist-db	O
is	O
released	O
under	O
version	O
2.1	O
of	O
the	O
GNU	B-Application
LGPL	I-Application
.	O
</s>
<s>
eXist-db	O
allows	O
software	O
developers	O
to	O
persist	O
XML/JSON/Binary	O
documents	O
without	O
writing	O
extensive	O
middleware	O
.	O
</s>
<s>
eXist-db	O
follows	O
and	O
extends	O
many	O
W3C	O
XML	B-Protocol
standards	O
such	O
as	O
XQuery	B-Language
.	O
</s>
<s>
eXist-db	O
also	O
supports	O
REST	B-Protocol
interfaces	I-Protocol
for	O
interfacing	O
with	O
AJAX-type	O
web	O
forms	O
.	O
</s>
<s>
Applications	O
such	O
as	O
XForms	B-Application
may	O
save	O
their	O
data	O
by	O
using	O
just	O
a	O
few	O
lines	O
of	O
code	O
.	O
</s>
<s>
The	O
WebDAV	B-Protocol
interface	O
to	O
eXist-db	O
allows	O
users	O
to	O
"	O
drag	O
and	O
drop	O
"	O
XML	B-Protocol
files	O
directly	O
into	O
the	O
eXist-db	O
database	O
.	O
</s>
<s>
eXist-db	O
was	O
awarded	O
the	O
best	O
XML	B-Protocol
database	O
of	O
the	O
year	O
by	O
InfoWorld	O
in	O
2006	O
.	O
</s>
<s>
Fixes	O
for	O
Log4Shell	O
vulnerability	O
and	O
breaking	O
changes	O
to	O
bundled	O
Apache	O
XML-RPC	B-Protocol
libraries	O
to	O
resolve	O
security	O
issues	O
.	O
</s>
<s>
More	O
than	O
1,400	O
commits	O
including	O
improvements	O
to	O
document	O
and	O
collection	O
locking	O
,	O
migration	O
of	O
build	O
system	O
from	O
Apache	B-Application
Ant	I-Application
to	O
Apache	B-Language
Maven	I-Language
,	O
support	O
removed	O
for	O
running	O
eXist-db	O
in	O
Apache	B-Language
Tomcat	I-Language
.	O
</s>
<s>
Almost	O
1,500	O
changes	O
including	O
support	O
for	O
XQuery	B-Language
v3.1	O
,	O
and	O
updated	O
version	O
of	O
Jetty	B-Language
with	O
HTTP/2	B-Protocol
support	O
.	O
</s>
