Requirement Engineering is considered a key factor for Information Systems and Technology (IST) success in innovation. After roughly 40 years, important questions about the impact of RE in innovations remains. Literature review and bibliometric reports are well-known techniques for describing the state of the art; however, both can cover what has been done, but fail to identify the less developed areas. An alternative method is used to describe the whole knowledge body of RE (KBoRE) for IST innovations, and then systematically identify the most, less and uncovered areas. This paper proposes an Ontological framework of the KBoRE for IST innovations, by decomposing it through the identification of taxonomies and concepts that represent the field. Then, we apply the ontology to map articles from SCOPUS and WoS databases. Results reveal emphases that help to design research agendas and feed the KBoRE for IST Innovations to fill the gaps between the academic curiosity and the industry progress.