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However, we still lack a unified definition and standard expression form of knowledge graph. The authors propose to clarify the expression of knowledge graph as a whole. They clarify the architecture of knowledge graph from data, information, knowledge, and wisdom aspects respectively. The authors also propose to specify knowledge graph in a progressive manner as four basic forms including data graph, information graph, knowledge graph and wisdom graph.<\/p>","DOI":"10.4018\/ijsi.2018040102","type":"journal-article","created":{"date-parts":[[2018,2,22]],"date-time":"2018-02-22T12:14:37Z","timestamp":1519301677000},"page":"10-25","source":"Crossref","is-referenced-by-count":23,"title":["Specifying Knowledge Graph with Data Graph, Information Graph, Knowledge Graph, and Wisdom Graph"],"prefix":"10.4018","volume":"6","author":[{"given":"Yucong","family":"Duan","sequence":"first","affiliation":[{"name":"College of Information Science and Technology, Hainan University, Haikou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lixu","family":"Shao","sequence":"additional","affiliation":[{"name":"Hainan Unviersity, Haikou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gongzhu","family":"Hu","sequence":"additional","affiliation":[{"name":"Central Michigan University, Mount Pleasant, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2432","reference":[{"key":"IJSI.2018040102-0","first-page":"276","article-title":"Data, information, knowledge, and wisdom.","author":"G.Bellinger","year":"2004","journal-title":"European Congress of Rheumatology Eular"},{"key":"IJSI.2018040102-1","author":"M.Chein","year":"2008","journal-title":"Graph-based Knowledge Representation: Computational Foundations of Conceptual Graphs"},{"key":"IJSI.2018040102-2","article-title":"Refinement from service economics planning to ubiquitous services implementation. 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