<s>
Document	B-Language
Schema	I-Language
Definition	I-Language
Languages	I-Language
(	O
DSDL	B-Language
)	O
is	O
a	O
framework	O
within	O
which	O
multiple	O
validation	O
tasks	O
of	O
different	O
types	O
can	O
be	O
applied	O
to	O
an	O
XML	B-Protocol
document	I-Protocol
in	O
order	O
to	O
achieve	O
more	O
complete	O
validation	O
results	O
than	O
just	O
the	O
application	O
of	O
a	O
single	O
technology	O
.	O
</s>
<s>
It	O
is	O
specified	O
as	O
a	O
multi-part	O
ISO/IEC	O
Standard	O
,	O
ISO/IEC	B-Language
19757	I-Language
.	O
</s>
<s>
DSDL	B-Language
defines	O
a	O
modular	O
set	O
of	O
specifications	O
for	O
describing	O
the	O
document	O
structures	O
,	O
data	O
types	O
,	O
and	O
data	O
relationships	O
in	O
structured	O
information	O
resources	O
.	O
</s>
