Ontologies, as semantic knowledge representation, have a crucial role in various information systems. The main pitfall of manually building ontologies is effort and time-consuming. Ontology learning is a key solution. Learning Non-Taxonomic Relationships of Ontologies (LNTRO) is the process of automatic\/semi-automatic extraction of all possible relationships between concepts in a specific domain, except the hierarchal relations. Most of the research works focused on the extraction of concepts and taxonomic relations in the ontology learning process. This article presents the results of a systematic review of the state-of-the-art approaches for LNTRO. Sixteen approaches have been described and qualitatively analyzed. The solutions they provide are discussed along with their respective positive and negative aspects. The goal is to provide researchers in this area a comprehensive understanding of the drawbacks of the existing work, thereby encouraging further improvement of the research work in this area. Furthermore, this article proposes a set of recommendations for future research.<\/p>","DOI":"10.4018\/ijswis.2021010105","type":"journal-article","created":{"date-parts":[[2021,2,9]],"date-time":"2021-02-09T22:09:06Z","timestamp":1612908546000},"page":"97-122","source":"Crossref","is-referenced-by-count":1,"title":["Learning Non-Taxonomic Relations of Ontologies"],"prefix":"10.4018","volume":"17","author":[{"given":"Mohamed Hassan Mohamed","family":"Ali","sequence":"first","affiliation":[{"name":"Faculty of Science, Alexandria University, Egypt"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-2818-5890","authenticated-orcid":true,"given":"Said","family":"Fathalla","sequence":"additional","affiliation":[{"name":"Bonn University, Germany & Faculty of Science, Alexandria University, Egypt"}]},{"given":"Mohamed","family":"Kholief","sequence":"additional","affiliation":[{"name":"Arab Academy for Science, Technology, and Maritime Transport, Egypt"}]},{"given":"Yasser Fouad","family":"Hassan","sequence":"additional","affiliation":[{"name":"Faculty of Science, Alexandria University, Egypt"}]}],"member":"2432","container-title":["International Journal on Semantic Web and Information Systems"],"original-title":[],"language":"ng","link":[{"URL":"https:\/\/www.igi-global.com\/viewtitle.aspx?TitleId=272536","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,5,6]],"date-time":"2022-05-06T20:44:34Z","timestamp":1651869874000},"score":1,"resource":{"primary":{"URL":"https:\/\/services.igi-global.com\/resolvedoi\/resolve.aspx?doi=10.4018\/IJSWIS.2021010105"}},"subtitle":["A Systematic Review"],"short-title":[],"issued":{"date-parts":[[2021,1,1]]},"references-count":0,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2021,1]]}},"URL":"https:\/\/doi.org\/10.4018\/ijswis.2021010105","relation":{},"ISSN":["1552-6283","1552-6291"],"issn-type":[{"value":"1552-6283","type":"print"},{"value":"1552-6291","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,1,1]]}}}