<s>
ISO	B-Application
10303-22	I-Application
is	O
a	O
part	O
of	O
the	O
implementation	O
methods	O
of	O
STEP	O
with	O
the	O
official	O
title	O
Standard	B-Application
data	I-Application
access	I-Application
interface	I-Application
or	O
simply	O
SDAI	B-Application
.	O
</s>
<s>
SDAI	B-Application
defines	O
an	O
abstract	O
Application	B-Application
Programming	I-Application
Interface	I-Application
(	O
API	B-Application
)	O
to	O
work	O
on	O
application	O
data	O
according	O
to	O
a	O
given	O
data	O
models	O
defined	O
in	O
EXPRESS	B-Application
.	O
</s>
<s>
SDAI	B-Application
itself	O
is	O
defined	O
independent	O
of	O
a	O
particular	O
programming	O
language	O
.	O
</s>
<s>
The	O
development	O
of	O
language	B-Application
bindings	I-Application
for	O
FORTRAN	B-Application
and	O
the	O
interface	B-General_Concept
definition	I-General_Concept
language	I-General_Concept
(	O
IDL	O
)	O
of	O
CORBA	B-Architecture
were	O
canceled	O
.	O
</s>
<s>
The	O
original	O
intent	O
of	O
SDAI	B-Application
and	O
its	O
bindings	O
to	O
programming	O
languages	O
was	O
to	O
achieve	O
portability	O
of	O
software	O
applications	O
from	O
one	O
implementation	O
to	O
another	O
.	O
</s>
<s>
This	O
was	O
soon	O
abandoned	O
because	O
there	O
were	O
only	O
a	O
few	O
commercial	O
implementations	O
and	O
they	O
differed	O
significantly	O
in	O
their	O
detailed	O
APIs	B-Application
.	O
</s>
<s>
Today	O
the	O
term	O
SDAI	B-Application
is	O
sometimes	O
used	O
for	O
many	O
types	O
of	O
APIs	B-Application
supporting	O
STEP	O
,	O
even	O
if	O
they	O
only	O
partially	O
follow	O
the	O
strict	O
functionality	O
as	O
defined	O
in	O
ISO	B-Application
10303-22	I-Application
and	O
its	O
implementation	O
methods	O
,	O
or	O
not	O
at	O
all	O
.	O
</s>
<s>
Part	O
35	O
of	O
STEP	O
(	O
Abstract	O
test	O
methods	O
for	O
SDAI	B-Application
implementations	O
)	O
provides	O
a	O
formal	O
way	O
how	O
to	O
prove	O
the	O
conformance	O
of	O
an	O
implementation	O
with	O
SDAI	B-Application
.	O
</s>
<s>
The	O
main	O
components	O
of	O
SDAI	B-Application
are	O
:	O
</s>
<s>
SDAI	B-Application
repository	O
the	O
physical	O
(	O
typically	O
)	O
container	O
to	O
store	O
SDAI	B-Application
models	O
and	O
Schema	O
instances	O
,	O
e.g.	O
</s>
<s>
:	O
The	O
Ecco	O
Toolkit	O
provides	O
implementation	O
of	O
ISO	B-Application
10303-11	I-Application
,	O
-14	O
,	O
-21	O
,	O
-28	O
.	O
</s>
<s>
The	O
is	O
a	O
public	O
domain	O
implementation	O
of	O
ISO	O
10303-21(ASCII data exchange files )	O
,	O
-22(SDAI )	O
,	O
-23	O
(	O
C++	B-Language
SDAI	B-Application
binding	O
)	O
using	O
ISO	O
10303-11:1994	O
.	O
</s>
<s>
STEPcode	O
(	O
formerly	O
STEP	O
Class	O
Library	O
)	O
has	O
been	O
improved	O
by	O
the	O
BRL-CAD	B-Language
developers	O
under	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
<s>
is	O
a	O
complete	O
implementation	O
of	O
ISO	O
10303-22(SDAI )	O
and	O
ISO	O
10303-27(Java SDAI binding )	O
under	O
the	O
Open	O
Source	O
license	O
AGPL	O
.	O
</s>
