Semantic Interoperability in XBRL Reports via Collaborative Ontology Mappings and Linked Data Principles Boris Villazon-Terrazas 1 , Freddy Priyatna 2 , Jose-Luis Redondo-Garcia 3 , and Nandana Mihindukulasooriya 2⋆ 1 Fujitsu Laboratories of Europe, Madrid, Spain 2 Ontology Engineering Group, Universidad Polit´ ecnica de Madrid, Madrid, Spain 3 Amazon, Cambridge, UK boris.villazon.terrazas@uk.fujitsu.com, {fpriyatna,jlredondo,nmihindu}@fi.upm.es Abstract. In an increasingly digitalized world, financial institutions have become data hoarders and find it difficult to efficiently exploit and interpret data from various sources. XBRL provides a global standard to exchange financial information. Although XBRL solves the syntactic het- erogeneity problem, it doesnt solve the semantic heterogeneity problem when involving multiple taxonomies. In this paper we propose a collab- orative approach for mapping these different XBRL taxonomies into a reference ontology stored in our mapping repository, MappingPedia. Keywords: XBRL, Linked Data, Mappings 1 INTRODUCTION XBRL 1 (eXtensible Business Reporting Language) is a freely available and global standard for exchanging business information. An XBRL document consists of an XBRL instance containing the business facts being reported and a collection of taxonomies defining metadata about the business facts. Though XBRL is a good step towards efficient dissemination of financial data, it doesnt ensure semantic interoperability because many jurisdictions have developed different taxonomies making it difficult to perform cross-company comparisons [1]. Two main challenges for such comparisons are the lack of alignment between different taxonomies used and the lack of unique identifiers for companies across different sources[2]. This paper proposes the use of a collaborative mapping approach of the different XBRL taxonomies into a reference ontology, based on FIBO and Financial Regulation XBRL ontology to address the first challenge and the use of Linked Data principles to address the second challenge. ⋆ This research is supported by the 4V Spanish national project (TIN2013-46238-C4- 2-R) project and the FPI grant (BES-2014-068449.) 1 http://www.xbrl.org/