实体、关系和多关系的形式化定义
参考 Multiple relations extraction among multiple entities in unstructured text
实体种类表、关系种类表、后选关系表
实体是作为一个主体或一个客体存在的东西，实际上或潜在地，具体地或抽象地，物理上或不是，代词（你，我，他）也是一种实体形式。 根据ACE2008，实体可以分为五类：人，组织，地缘政治实体，位置和设施。 我们标记了这些实体类型，如表2所示。
An entity is something that exists as itself, as a subject or as an object, actually or potentially, concretely or abstractly, physically or not, the pronoun (you, me, he) is also a form of entity. According to ACE2008, entities can be classified into five categories: Person, Organization, Geo-political entity, Location and Facility. We label these entity types as shown in Table 2.
两个实体之间的关系可以分为七类：物理，部分整体，个人社会，ORG-Af fi lation，Agent-Artifact，Gen-Affliation和NA.3我们将这些关系类型标记为表3所示。
The relations between two entities can be classified into seven categories: Physical, Part-whole, Personal-Social, ORG-Affiliation, Agent-Artifact, Gen-Affiliation and NA.3 We label these relation types as shown in Table 3.
表4显示了双实体对需要满足的条件，以在它们之间形成某种类型的关系。
Table 4 shows the conditions that a two-entity pair need to meet to form a certain type relation between them.
实体关系的形式化定义
