The call for papers for the Sixth International Conference on Metadata and Semantic has been published. The MTSR'12 targets researchers and practitioners from the fields of metadata and semantics research as well as applications of the semantic web and related technologies. The conference topic is metadata and their relationships with Ontologies, Semantic Web, Knowledge Management and Software Engineering. Several different tracks are organized to be held in the conference program like for example a Track on Metadata & Semantics for Open Access Repositories, Research Information Systems and Infrastructures or a Track on Linked data. The conference proceedings will be published in the Springer’s Communication in Computer and Information Science series. All interested in presenting their work in a presentation or a poster are invited to submit their papers until 20^th of July. The conference will take place from 28^th to 30^th November 2012 at the University of Cadiz in Spain.