How to add a OPDS-Source?

[Fantaa]

Moin,

the german "Flaschenpost" provides a OPDS catalog of there articles. This means: the articles are already stored in the ePub format.
How can I just download them? The main start point is
http://flaschenpost.piratenpartei.de/catalog/
but the most interesting is
http://flaschenpost.piratenpartei.de.../date/2012.xml
The sinlge entries look like this:

  <entry>
    <title>Schleswig-Holstein gegen Gesetzentwurf zur Telekommunikationsdatenabfrage</title>
    <id>urn:x-flaschenpost:catalog:item:26477</id>
    <updated>2012-12-13T10:11:33.000000+00:00</updated>
    <link href="http://flaschenpost.piratenpartei.de//files/2012/12/26477.epub" type="application/epub+zip" rel="http://opds-spec.org/acquisition"/>
    <dcterms:issued>2012</dcterms:issued>
    <author>
      <name>Klaus Neubauer</name>
    </author>
    <dcterms:publisher>Flaschenpost - Das Nachrichtenmagazin der Piratenpartei</dcterms:publisher>
    <dcterms:language>de</dcterms:language>
    <content type="html"></content>
  </entry>

It's not clear to me how a can just add a "download or update all" recipe?

Thanks