<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
Hennessy	B-Application
–	I-Application
Milner	I-Application
logic	I-Application
(	O
HML	O
)	O
is	O
a	O
dynamic	O
logic	O
used	O
to	O
specify	O
properties	O
of	O
a	O
labeled	B-Application
transition	I-Application
system	I-Application
(	O
LTS	O
)	O
,	O
a	O
structure	O
similar	O
to	O
an	O
automaton	O
.	O
</s>
<s>
Another	O
variant	O
of	O
the	O
HML	O
involves	O
the	O
use	O
of	O
recursion	O
to	O
extend	O
the	O
expressibility	O
of	O
the	O
logic	O
,	O
and	O
is	O
commonly	O
referred	O
to	O
as	O
'	O
Hennessy-Milner	B-Application
Logic	I-Application
with	O
recursion	O
 '	O
.	O
</s>
