“…Kang and Hong [29] classified them into five groups based on similar subject keywords, namely schema-based, service-based, ontology-based, processes-based, and system-based approaches. Meanwhile, Amirebrahimi, Rajabifard et al [33] gave a three-level framework, which groups those studies into application, process, and data level. At the data level, data structures are modified to meet the requirements of the other application, or existing data standards are extended.…”