<s>
SecPAL	B-Language
is	O
a	O
declarative	O
,	O
logic-based	O
,	O
security	O
policy	O
language	O
that	O
has	O
been	O
developed	O
to	O
support	O
the	O
complex	O
access	O
control	O
requirements	O
of	O
large	O
scale	O
distributed	B-Architecture
computing	I-Architecture
environments	O
.	O
</s>
<s>
Here	O
is	O
a	O
partial-list	O
of	O
some	O
of	O
the	O
challenges	O
that	O
SecPAL	B-Language
addresses	O
:	O
</s>
<s>
How	O
can	O
access	O
control	O
policy	O
be	O
authored	O
and	O
reviewed	O
in	O
a	O
manner	O
that	O
is	O
human	B-General_Concept
readable	I-General_Concept
-	O
allowing	O
auditors	O
and	O
non-technical	O
people	O
to	O
understand	O
such	O
policies	O
?	O
</s>
<s>
The	O
SecPAL	B-Language
Research	O
homepage	O
includes	O
links	O
to	O
the	O
following	O
papers	O
which	O
describe	O
the	O
architecture	O
of	O
SecPAL	B-Language
at	O
varying	O
levels	O
of	O
abstraction	O
.	O
</s>
<s>
SecPAL	B-Language
Formal	O
Model	O
(	O
"	O
Design	O
and	O
Semantics	O
of	O
a	O
Decentralized	O
Authorization	O
Language	O
"	O
)	O
–	O
Formal	O
description	O
of	O
the	O
abstract	O
types	O
,	O
language	O
semantics	O
and	O
evaluation	O
rules	O
that	O
support	O
deterministic	O
evaluation	O
in	O
efficient	O
time	O
.	O
</s>
