<s>
ALFA	B-Language
,	O
or	O
the	O
Abbreviated	O
Language	O
For	O
Authorization	O
,	O
is	O
a	O
domain-specific	B-Language
language	I-Language
used	O
in	O
the	O
formulation	O
of	O
access-control	O
policies	O
.	O
</s>
<s>
XACML	O
,	O
the	O
eXtensible	O
Access	O
Control	O
Markup	O
Language	O
,	O
uses	O
XML	B-Protocol
as	O
its	O
main	O
encoding	O
language	O
.	O
</s>
<s>
Axiomatics	O
researcher	O
,	O
Pablo	O
Giambiagi	O
,	O
therefore	O
designed	O
ALFA	B-Language
,	O
the	O
Axiomatics	O
Language	O
for	O
Authorization	O
.	O
</s>
<s>
ALFA	B-Language
maps	O
directly	O
into	O
XACML	O
.	O
</s>
<s>
ALFA	B-Language
contains	O
the	O
same	O
structural	O
elements	O
as	O
XACML	O
i.e.	O
</s>
<s>
In	O
March	O
2014	O
,	O
Axiomatics	O
announced	O
it	O
was	O
donating	O
ALFA	B-Language
to	O
the	O
OASIS	O
XACML	O
Technical	O
Committee	O
in	O
order	O
to	O
advance	O
its	O
standardization	O
.	O
</s>
<s>
ALFA	B-Language
was	O
consequently	O
renamed	O
Abbreviated	O
Language	O
for	O
Authorization	O
and	O
filed	O
for	O
standardization	O
.	O
</s>
<s>
Attributes	O
make	O
up	O
the	O
building	O
blocks	O
of	O
policies	O
in	O
ABAC	O
and	O
consequently	O
in	O
ALFA	B-Language
.	O
</s>
<s>
Just	O
like	O
XACML	O
,	O
ALFA	B-Language
has	O
three	O
structural	O
elements	O
:	O
</s>
<s>
In	O
addition	O
,	O
in	O
ALFA	B-Language
,	O
it	O
's	O
possible	O
to	O
add	O
Rule	O
elements	O
to	O
PolicySet	O
and	O
Policy	O
elements	O
.	O
</s>
<s>
In	O
order	O
to	O
resolve	O
conflicts	O
between	O
siblings	O
,	O
ALFA	B-Language
(	O
as	O
does	O
XACML	O
)	O
uses	O
combining	O
algorithms	O
.	O
</s>
<s>
ALFA	B-Language
supports	O
all	O
the	O
data	O
types	O
that	O
are	O
defined	O
in	O
the	O
OASIS	O
XACML	O
Core	O
Specification	O
.	O
</s>
<s>
numerical	O
(	O
integer	O
,	O
double	O
)	O
and	O
boolean	O
map	O
directly	O
from	O
ALFA	B-Language
to	O
XACML	O
.	O
</s>
<s>
String	O
,	O
integer	O
,	O
double	O
,	O
and	O
boolean	O
all	O
map	O
directly	O
from	O
ALFA	B-Language
to	O
XACML	O
.	O
</s>
<s>
The	O
following	O
ALFA	B-Language
example	O
represents	O
a	O
XACML	O
policy	O
which	O
contains	O
a	O
single	O
rule	O
.	O
</s>
<s>
ALFA	B-Language
can	O
use	O
policy	O
(	O
set	O
)	O
references	O
.	O
</s>
<s>
The	O
following	O
is	O
an	O
example	O
of	O
an	O
ABAC	O
policy	O
implemented	O
using	O
ALFA	B-Language
.	O
</s>
<s>
HL7	O
defines	O
a	O
series	O
of	O
medical	O
access	O
control	O
which	O
can	O
be	O
easily	O
defined	O
in	O
ALFA	B-Language
.	O
</s>
<s>
It	O
can	O
also	O
compile	O
ALFA	B-Language
into	O
XACML	O
3.0	O
.	O
</s>
<s>
The	O
ALFA	B-Language
Plugin	O
for	O
Eclipse	O
is	O
a	O
tool	O
that	O
converts	O
your	O
Eclipse	O
programming	O
IDE	O
to	O
a	O
dedicated	O
editor	O
of	O
authorization	O
policies	O
using	O
ALFA	B-Language
syntax	O
.	O
</s>
<s>
ALFA	B-Language
policies	O
can	O
then	O
easily	O
be	O
converted	O
into	O
XACML	O
3.0	O
policies	O
and	O
loaded	O
into	O
your	O
XACML	O
policy	O
management	O
tool	O
.	O
</s>
