<s>
Isearch	B-Application
is	O
open-source	B-Application
text	B-Algorithm
retrieval	I-Algorithm
software	O
first	O
developed	O
in	O
1994	O
by	O
Nassib	O
Nassar	O
as	O
part	O
of	O
the	O
Isite	O
Z39.50	B-Protocol
information	O
framework	O
.	O
</s>
<s>
The	O
project	O
started	O
at	O
the	O
Clearinghouse	B-Application
for	I-Application
Networked	I-Application
Information	I-Application
Discovery	I-Application
and	I-Application
Retrieval	I-Application
(	O
CNIDR	B-Application
)	O
of	O
the	O
North	O
Carolina	O
supercomputing	O
center	O
MCNC	O
and	O
funded	O
by	O
the	O
National	O
Science	O
Foundation	O
to	O
follow	O
in	O
the	O
track	O
of	O
WAIS	B-Protocol
and	O
develop	O
prototype	O
systems	O
for	O
distributed	O
information	O
networks	O
encompassing	O
Internet	O
applications	O
,	O
library	O
catalogs	O
and	O
other	O
information	O
resources	O
.	O
</s>
<s>
The	O
main	O
features	O
of	O
Isearch	B-Application
include	O
full	O
text	O
and	O
field	O
searching	O
,	O
relevance	O
ranking	O
,	O
Boolean	O
queries	O
,	O
and	O
support	O
for	O
many	O
document	O
types	O
such	O
as	O
HTML	O
,	O
mail	O
folders	O
,	O
list	O
digests	O
,	O
MEDLINE	O
,	O
BibTeX	O
,	O
SGML/XML	O
,	O
FGDC	O
Metadata	O
,	O
NASA	O
DIF	O
,	O
ANZLIC	O
metadata	O
,	O
ISO	O
19115	O
metadata	O
and	O
many	O
other	O
resource	O
types	O
and	O
document	O
formats	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
search	O
engine	O
to	O
be	O
designed	O
from	O
the	O
ground	O
up	O
to	O
support	O
SGML	B-Language
and	O
Z39.50	B-Protocol
search	O
and	O
retrieval	O
.	O
</s>
<s>
The	O
Isearch	B-Application
search/indexing	O
text	O
algorithms	O
were	O
based	O
on	O
Gaston	O
Gonnet	O
's	O
seminal	O
work	O
into	O
PAT	O
arrays	O
and	O
trees	O
for	O
text	O
retrieval---	O
ideas	O
that	O
were	O
developed	O
for	O
the	O
New	O
Oxford	O
English	O
Dictionary	O
Project	O
at	O
the	O
Univ	O
.	O
</s>
<s>
of	O
Waterloo	O
,	O
and	O
provided	O
the	O
seeds	O
for	O
Tim	O
Bray	O
's	O
PAT	O
SGML	B-Language
engine	O
that	O
formed	O
the	O
basis	O
of	O
Open	O
Text	O
.	O
</s>
<s>
One	O
of	O
the	O
limiting	O
factors	O
,	O
however	O
,	O
of	O
the	O
Isearch	B-Application
design	O
was	O
that	O
it	O
was	O
not	O
well	O
suited	O
to	O
handle	O
the	O
extremely	O
large	O
data	O
sets	O
that	O
became	O
popular	O
in	O
the	O
mid	O
to	O
late	O
1990s	O
.	O
</s>
<s>
In	O
many	O
cases	O
Isearch	B-Application
was	O
adapted	O
or	O
modified	O
to	O
use	O
different	O
algorithms	O
but	O
usually	O
retained	O
the	O
document	O
type	O
model	O
and	O
the	O
architectural	O
relationship	O
with	O
Isite	O
.	O
</s>
<s>
Isearch	B-Application
was	O
widely	O
adopted	O
and	O
used	O
in	O
hundreds	O
of	O
public	O
search	O
sites	O
,	O
including	O
many	O
high	O
profile	O
projects	O
such	O
as	O
the	O
U.S.	O
Patent	O
and	O
Trademark	O
Office	O
(	O
USPTO	O
)	O
patent	O
search	O
,	O
the	O
Federal	O
Geographic	O
Data	O
Clearinghouse	O
(	O
FGDC	O
)	O
,	O
the	O
NASA	O
Global	O
Change	O
Master	O
Directory	O
,	O
the	O
NASA	O
EOS	O
Guide	O
System	O
,	O
the	O
NASA	O
Catalog	O
Interoperability	O
Project	O
,	O
the	O
astronomical	O
pre-print	O
service	O
based	O
at	O
the	O
Space	O
Telescope	O
Science	O
Institute	O
,	O
The	O
PCT	O
Electronic	O
Gazette	O
at	O
the	O
World	O
Intellectual	O
Property	O
Organization	O
(	O
WIPO	O
)	O
,	O
[ [ 	O
Linsearch	O
(	O
a	O
search	O
engine	O
for	O
Open	B-Application
Source	I-Application
Software	I-Application
designed	O
by	O
Miles	O
Efron	O
)	O
,	O
the	O
SAGE	O
Project	O
of	O
the	O
Special	O
Collections	O
Department	O
at	O
Emory	O
University	O
,	O
Eco	O
Companion	O
Australasia	O
(	O
an	O
environmental	O
geospatial	O
resources	O
catalog	O
)	O
,	O
Australian	O
National	O
Genomic	O
Information	O
Service	O
(	O
ANGIS	B-Application
)	O
,	O
the	B-Application
Open	I-Application
Directory	I-Application
Project	I-Application
and	O
numerous	O
governmental	O
portals	O
in	O
the	O
context	O
of	O
the	O
Government	O
Information	O
Locator	O
Service	O
(	O
GILS	O
)	O
GPO	O
mandate	O
(	O
ended	O
in	O
2005	O
?	O
</s>
<s>
From	O
1994	O
to	O
1998	O
most	O
of	O
the	O
development	O
was	O
centered	O
on	O
the	O
Clearinghouse	B-Application
for	I-Application
Networked	I-Application
Information	I-Application
Discovery	I-Application
and	I-Application
Retrieval	I-Application
(	O
CNIDR	B-Application
)	O
in	O
North	O
Carolina	O
(	O
Engine	O
core	O
)	O
and	O
BSn	O
in	O
Germany	O
(	O
Doctypes	O
)	O
.	O
</s>
<s>
By	O
1998	O
much	O
of	O
the	O
open-source	B-Application
Isearch	B-Application
core	O
developers	O
re-focused	O
development	O
into	O
several	O
spin-offs	O
.	O
</s>
<s>
As	O
of	O
2010	O
,	O
the	O
open	O
source	O
version	O
of	O
Isearch	B-Application
is	O
still	O
used	O
on	O
250+	O
nodes	O
of	O
FGDC	O
,	O
and	O
by	O
ANZLIC	O
in	O
Australia	O
and	O
selected	O
Geospatial	O
OneStop	O
contributors	O
to	O
facilitate	O
harvesting	O
by	O
GOS	O
,	O
including	O
NOAA	O
,	O
Census	O
Bureau	O
and	O
the	O
Tenn	O
.	O
Field	O
Office	O
of	O
the	O
US	O
Fish	O
and	O
Wildlife	O
Service	O
,	O
among	O
others	O
.	O
</s>
