defclass and defmethod

opensourcer has asked for the wisdom of the Perl Monks concerning the following question:

hi, what are these defclass and defmethod, i saw them in one of the examples.

defclass  EXAMPLE;

defmethod new: class
{
 .....
}

defmethod printone
{
.....
}

sub othermethod
{
....
}
[download]

i have searched for documentation couldn't find about them. Can any 1 explain the hole concept or give me the url to the doc.
thanks