<s>
In	O
the	O
Unified	B-Language
Modeling	I-Language
Language	I-Language
(	O
UML	B-Language
)	O
,	O
an	O
Element	O
is	O
an	O
abstract	O
class	O
with	O
no	O
superclass	O
.	O
</s>
<s>
It	O
is	O
used	O
as	O
the	O
superclass	O
or	O
base	O
class	O
,	O
as	O
known	O
by	O
object	O
oriented	O
programmers	O
,	O
for	O
all	O
the	O
metaclasses	O
in	O
the	O
UML	B-Language
infrastructure	O
library	O
.	O
</s>
<s>
All	O
other	O
elements	O
in	O
the	O
UML	B-Language
inherit	O
,	O
directly	O
or	O
indirectly	O
from	O
Element	O
.	O
</s>
<s>
An	O
association	O
describes	O
a	O
set	O
of	O
tuples	B-Application
of	O
typed	O
instances	O
.	O
</s>
<s>
The	O
Element	O
class	O
belongs	O
to	O
the	O
base	O
package	O
in	O
the	O
UML	B-Language
called	O
the	O
Kernel	O
.	O
</s>
<s>
This	O
is	O
the	O
package	O
that	O
contains	O
the	O
superclasses	O
that	O
make	O
up	O
the	O
superstructure	O
of	O
the	O
UML	B-Language
.	O
</s>
