<s>
Archival	B-Application
Data	O
Description	O
Mark-up	O
Language	O
(	O
ADDML	B-Language
)	O
is	O
a	O
standard	O
describing	O
a	O
collection	O
of	O
data	B-General_Concept
files	I-General_Concept
.	O
</s>
<s>
ADDML	B-Language
is	O
a	O
standard	O
describing	O
a	O
collection	O
of	O
data	B-General_Concept
files	I-General_Concept
organised	O
as	O
flat	B-Application
files	I-Application
.	O
</s>
<s>
A	O
flat	B-Application
file	I-Application
in	O
this	O
context	O
is	O
a	O
file	O
existing	O
as	O
plain	O
text	O
,	O
internally	O
organised	O
either	O
by	O
fixed	O
positioning	O
or	O
delimiter	B-Protocol
separation	I-Protocol
.	O
</s>
<s>
Such	O
a	O
collection	O
of	O
files	O
is	O
called	O
a	O
dataset	B-General_Concept
.	O
</s>
<s>
A	O
file	O
containing	O
the	O
description	O
of	O
a	O
dataset	B-General_Concept
is	O
called	O
a	O
dataset	B-General_Concept
description	O
.	O
</s>
<s>
ADDML	B-Language
serves	O
several	O
purposes	O
.	O
</s>
<s>
Its	O
main	O
task	O
is	O
to	O
describe	O
the	O
technical	O
structure	O
of	O
a	O
dataset	B-General_Concept
designated	O
for	O
repository	B-General_Concept
submissions	O
.	O
</s>
<s>
Today	O
’s	O
standard	O
sees	O
an	O
extension	O
of	O
its	O
original	O
purpose	O
,	O
but	O
the	O
technical	O
structure	O
remains	O
,	O
making	O
it	O
possible	O
to	O
describe	O
a	O
flat	B-Application
file	I-Application
structure	O
when	O
it	O
is	O
to	O
be	O
exchanged	O
from	O
one	O
system	O
to	O
another	O
(	O
and	O
not	O
only	O
for	O
archival	B-Application
purposes	O
)	O
.	O
</s>
<s>
Emphasis	O
in	O
the	O
implementation	O
of	O
describing	O
other	O
files	O
than	O
flat	B-Application
files	I-Application
in	O
ADDML	B-Language
has	O
been	O
put	O
on	O
the	O
option	O
of	O
describing	O
the	O
file	O
types	O
,	O
the	O
relation	O
between	O
them	O
and	O
so	O
forth	O
.	O
</s>
<s>
The	O
implementation	O
of	O
ADDML	B-Language
requires	O
limitations	O
.	O
</s>
