<s>
A	O
classifier	B-Language
is	O
a	O
category	O
of	O
Unified	B-Language
Modeling	I-Language
Language	I-Language
(	O
UML	B-Language
)	O
elements	O
that	O
have	O
some	O
common	O
features	O
,	O
such	O
as	O
attributes	B-General_Concept
or	O
methods	O
.	O
</s>
<s>
A	O
classifier	B-Language
is	O
an	O
abstract	B-Application
metaclass	B-Language
classification	O
concept	O
that	O
serves	O
as	O
a	O
mechanism	O
to	O
show	O
interfaces	B-Application
,	O
classes	O
,	O
datatypes	O
and	O
components	B-Library
.	O
</s>
<s>
A	O
classifier	B-Language
describes	O
a	O
set	O
of	O
instances	O
that	O
have	O
common	O
behavioral	O
and	O
structural	O
features	O
(	O
operations	O
and	O
attributes	B-General_Concept
,	O
respectively	O
)	O
.	O
</s>
<s>
A	O
classifier	B-Language
is	O
a	O
namespace	O
whose	O
members	B-Language
can	O
specify	O
a	O
generalization	O
hierarchy	O
by	O
referencing	O
its	O
general	O
classifiers	B-Language
.	O
</s>
<s>
A	O
classifier	B-Language
is	O
a	O
type	O
and	O
can	O
own	O
generalizations	O
,	O
thereby	O
making	O
it	O
possible	O
to	O
define	O
generalization	O
relationships	O
to	O
other	O
classifiers	B-Language
.	O
</s>
<s>
A	O
classifier	B-Language
is	O
a	O
redefinable	O
element	O
,	O
as	O
it	O
is	O
possible	O
to	O
redefine	O
nested	O
classifiers	B-Language
.	O
</s>
<s>
All	O
objects	O
that	O
can	O
have	O
instances	O
are	O
classifiers	B-Language
.	O
</s>
<s>
A	O
classifier	B-Language
defines	O
a	O
namespace	O
.	O
</s>
<s>
A	O
classifier	B-Language
contains	O
a	O
set	O
of	O
features	O
.	O
</s>
<s>
A	O
classifier	B-Language
is	O
generalizable	O
.	O
</s>
