Towards Semantic Latvia Janis BARZDINS, Guntis BARZDINS, Rihards. BALODIS, Karlis CERANS, Audris KALNINS, Martins OPMANIS, Karlis PODNIEKS Institute of Mathematics and Computer Science University of Latvia, Riga LV-1459, Latvia Abstract. Tim Berners-Lee and co-authors in their seminal paper “The Semantic Web”, published in 2001, outlined their vision about the future Semantic Web. But today we are still far from the implementation of this vision. Despite fundamental achievements, like definition of OWL (Web Ontology Language) and rapid progress of RDF/OWL content creation, storage and processing tools, there are still very few attempts to merge these isolated “islands of success” into a killer application, understandable and useful also outside the expert academic community. The primary intent of this paper is to integrate such still isolated results into the unified “Semantic Latvia” conception. The other intent is to propose solutions for the identified missing components in the three fields: 1) technology for gathering of information for the Semantic Web, 2) RDF data stores and efficient access to this information, 3) Semantic Web query tools based on MDA approach. Keywords. Semantic web, domain ontologies, in-memory RDF data sores, MDA, national information infrastructure Introduction Tim Berners-Lee and co-authors in their seminal paper [1] outlined the key principles for the future Semantic Web. Their vision was based on the assumption that information will be distributed globally just like web pages in the current WWW, except this information will be supplemented with the machine-readable semantic tagging. Such machine readable semantic tagging then would allow software agents to automatically perform many information processing tasks, which currently can be handled only manually (like planning a therapy course for Pete’s mom in [1]). But currently the implementation of this vision is still associated with major theoretical and technical difficulties. Despite fundamental achievements, like definition of OWL (Web Ontology Language) and rapid progress of RDF/OWL content creation, storage and processing tools, there are still not many attempts to merge these results into the unified “killer application”, which would be understandable and useful also to the end-users outside the “academic/nerdy ghetto” [2] – to those without knowledge of OWL and university grade in ontology engineering. The primary goal of this paper is to integrate the fragmented Semantic Web achievements into the unified “Semantic Latvia” conception aimed to allow a small country like Latvia already today to take advantage of the emerging Semantic Web technologies. In this paper we are intentionally ignoring the privacy issues involved, as our prime goal is to illustrate the new information system architectures enabled by the Semantic Web.