1.1 http://explain.z3950.org/dtd/2.0/ philosophie-wissenschaft-kontroversen.de 80 /XML/sru.php Lexikon der Argumente Martin Schulz email@lexikon-der-argumente.de Titel title title Autor author creator Beschreibung title abstract Beschreibung keywords subject Dublin Core 10 oai_dc >= <= > < == = <> any all