<s>
Z++	B-Application
(	O
pronounced	O
zed	O
,	O
or	O
zee	O
in	O
American	O
pronunciation	O
,	O
plus	O
plus	O
)	O
is	O
an	O
object-oriented	B-Language
extension	O
to	O
the	O
Z	B-Language
specification	I-Language
language	I-Language
.	O
</s>
<s>
Z++	B-Application
allows	O
for	O
the	O
definition	O
of	O
classes	O
,	O
and	O
the	O
relation	O
of	O
classes	O
through	O
inheritance	B-Language
,	O
association	B-Application
,	O
or	O
aggregation	O
.	O
</s>
<s>
The	O
primary	O
construct	O
of	O
Z++	B-Application
is	O
a	O
class	O
.	O
</s>
<s>
A	O
Z++	B-Application
class	O
consists	O
of	O
a	O
number	O
of	O
clauses	O
which	O
are	O
optional	O
.	O
</s>
<s>
Lano	O
,	O
K.C.	O
,	O
Z++	B-Application
,	O
an	O
Object-Oriented	B-Language
Extension	O
to	O
Z''	O
.	O
</s>
<s>
Z	B-Language
User	O
Workshop	O
,	O
Oxford	O
1990	O
,	O
Springer	O
,	O
Workshops	O
in	O
Computing	O
,	O
1991	O
,	O
pp.151	O
–	O
172	O
.	O
</s>
<s>
Lano	O
,	O
K.C.	O
,	O
Formal	O
Object-Oriented	B-Language
Development	O
.	O
</s>
