The papers in this volume were presented at TMRA 2007, the International Conference on Topic Maps Research and Applications, held October 11-12, 2007, in Leipzig, Germany. TMRA 2007 was the third conference in an annual series of international conferences dedicated to Topic Maps in science and industry. The motto of TMRA 2007 was "Scaling Topic Maps." Taken literally the motto implies developing Topic Maps approaches that scale to large data and user volumes. This is a very real and useful research problem which is addressed by many of the contributions to the conference. But there is an even broader interpretation of the motto: wide adoption of Topic Maps in academia and industry. This is an equally important problem, and one that the TMRA conference series exists to help solve. And there is a more fanciful view on the motto. To "scale" can also mean to climb, so for the attendees the conference provided a way to "scale the mountain of Topic Maps." In all these ways TMRA 2007 helped to scale Topic Maps.

This book constitutes the thoroughly refereed post-proceedings of the Second International Conference on Topic Map Research and Applications, TMRA 2006, held in Leipzig, Germany in October 2006.

The 15 revised full papers and 6 revised short papers presented together with 1 invited lecture were carefully selected during two rounds of reviewing and improvement from a total of 52 submissions. The papers are organized in topical sections headed creation and visualization of topic maps, applied topic maps in industry, administration and sciences, standards related research, leveraging the semantics, technical issues of topic mapping, and social software with topic maps.

This book constitutes the thoroughly refereed post-proceedings of the First International Workshop on Topic Map Research and Applications, held in October 2005. The 17 revised full papers and five revised short papers presented together with one invited lecture were carefully selected during two rounds of reviewing and improvement from more than 35 submissions. One of the goals of the workshop is to survey and structure the field of topic map research and the emerging topic map technologies.