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Module dependent initialization, every subclass shall override it
and call the _Init of its SUPER class. This method is called by the new method of C<Arc>.


B<Returns:> true, if all passed values are in their definition scope, otherwise false


B<Example:>

see source code of any non-abstract sub class of Arc


=item _SetError ( ... (message)  ) I<inherited from Arc>

B<Description>: SetError function.
This function prepends the error message (@_) to an existing error message (if any) and
logs the message with LOG_ERR facility.
Use this function for setting an error from class level. Users should use IsError 
to get the message if a function failed.


B<Returns:> always false


B<Example:>

return $this->_SetError("User is not allowed to do this."); # breaks when an error occured


=back 

=over 2

=back 

=head3 PRIVATE METHODS

=head1 SEE ALSO

L<Arc>, L<Arc::Command>, L<Arc::Connection>, 
L<Arc::Connection::Server>, L<Arc::Connection::Client>,
L<arcx>, L<arcxd>, L<Authen::SASL>, L<Authen::SASL::Cyrus>
L<Net::Server::PreFork>

=head1 AUTHOR

 Patrick Boettcher <patrick.boettcher@desy.de>

=head1 COPYRIGHT AND LICENSE

Copyright (c) 2003-5 Patrick Boettcher <patrick.boettcher@desy.de> and others.
All rights reserved.
Zeuthen, Germany, (old) Europe

 This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

 Special thanks go to:
DESY Zeuthen, in particular:

- Wolfgang Friebel for bleeding edge testing and heavy bug reporting (and the idea of reimplementing ARC).

- Waltraut Niepraschk and Andreas Haupt for their help and support during the development. 

=cut