A knowledge graph is a graph of RDF triples. Commonly inference is very simple and OWL is not involved. However, entities in nodes are often typed as datatypes (e.g. integer, string ) or classes (e.g. city, place, human).
    知识图是RDF三元组的图。一般推断很简单，不涉及OWL。然而，节点中的实体通常被类型化为数据类型(例如整数、字符串)或类(例如城市、地点、人)。