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diff --git a/installer/OpenSLX/OSExport/ExportType/Base.pm b/installer/OpenSLX/OSExport/ExportType/Base.pm
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+++ b/installer/OpenSLX/OSExport/ExportType/Base.pm
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+# Base.pm - provides empty base of the OpenSLX OSExport::ExportType API.
+#
+# (c) 2006 - OpenSLX.com
+#
+# Oliver Tappe <ot@openslx.com>
+#
+package OpenSLX::OSExport::ExportType::Base;
+
+use vars qw($VERSION);
+$VERSION = 1.01;		# API-version . implementation-version
+
+use strict;
+use Carp;
+
+################################################################################
+### interface methods
+################################################################################
+sub new
+{
+	confess "Creating OpenSLX::OSExport::ExportType::Base-objects directly makes no sense!";
+}
+
+sub initialize
+{
+	my $self = shift;
+	my $engine = shift;
+
+	$self->{'engine'} = $engine;
+
+	# read filter information:
+	my (@includeList, @excludeList);
+	my $distroName = $engine->{'distro-name'};
+	my $filterFile = "../lib/distro-info/$distroName/export-filter";
+	if (open(FILTER, "< $filterFile")) {
+		while(<FILTER>) {
+			chomp;
+			push @includeList, "$_" if /^\+\s+/;
+			push @excludeList, "$_" if /^\-\s+/;
+		}
+		close(FILTER);
+	}
+	$self->{'exclude-list'} = \@excludeList;
+	$self->{'include-list'} = \@includeList;
+}
+
+sub exportVendorOS
+{
+}
+
+1;
+################################################################################
+
+=pod
+
+=head1 NAME
+
+OpenSLX::OSExport::ExportType::Base - the base class for all OSExport::ExportTypes
+
+=head1 SYNOPSIS
+
+  package OpenSLX::OSExport::ExportType::coolnewexporter;
+
+  use vars qw(@ISA $VERSION);
+  @ISA = ('OpenSLX::OSExport::ExportType::Base');
+  $VERSION = 1.01;
+
+  use coolnewexporter;
+
+  sub new
+  {
+      my $class = shift;
+      my $self = {};
+      return bless $self, $class;
+  }
+
+  # override all methods of OpenSLX::OSExport::ExportType::Base in order to
+  # implement the support for a new export-type
+  ...
+
+I<The synopsis above outlines a class that implements a
+OSExport::ExportType for the (imaginary) export-type B<coolnewexporter>>
+
+=cut