The papers in this volume were presented at the workshop "Topic Map Research and Applications 2005" held on October 6-7, 2005, in Leipzig. TMRA 2005 was the first workshop of an annual series of international workshops dedicated to topic maps in research and industry. As the motto "Charting the Topic Maps Research and Applications Landscape" suggests, the aim of TMRA 2005 was to identify the primary open issues in research, learn about who is working on what, bring together researchers and application pioneers, stimulate the systematic tackling of such issues, and foster the exchange of ideas...