Annotation Scheme and Specification for Named Entities and Relations on Chinese Medical Knowledge Graph

The medical knowledge graph describes medical entities and relations in a structured form, which is one of the most important representations for integrating massive medical resources. It is widely used in intelligent question-answering, clinical decision support, and other medical services. The key to building a high-quality medical knowledge graph is the standardization of named entities and relations. However, the research in annotation and specification of named entities and relations is limited. Based on the current research on the medical annotated corpus, this paper establishes an annotation scheme and specification for named entities and relations centered on diseases under the guidance of physicians. The specification contains 11 medical concepts and 12 medical relations. Medical concepts include the diagnosis, treatment, and prognosis of diseases. Medical relations focus on relation types between diseases and medical concepts. In accordance with the specification, a new Chinese medical annotated corpus of high consistency is constructed.