Foundation of knowledge atlas (II) - knowledge expression system of knowledge atlas

from ：https://www.jianshu.com/p/941dc6d7e760

Knowledge map basis （ Two ）- Knowledge representation system of knowledge map

The previous article mainly briefly introduced what is the knowledge map , What is a knowledge base , And the basic application of knowledge map . Knowledge expression system can be said to be the soul of the application of the whole knowledge map , This paper mainly explains the knowledge expression system of knowledge map from the perspective of products .

Definition of triples

《 Knowledge map basis （ One ）- What is knowledge map 》 As mentioned in freebase As a representative of the curated KBs Is essentially a triple , Next, we will explain the basic components of triples .

 

Entity （Entity）

An entity is an abstraction of an objective individual , A person 、 A movie 、 A word can be regarded as an entity . for example ： Yao Ming , Ang Lee , I am not pan jinlian

 

type （type）

A type is an abstraction of a collection of entities with the same characteristics or attributes .

give an example ： China is an entity , The United States is an entity , France is an entity . These entities have capitals 、 Population 、 Common features such as area , So like China 、 The United States 、 France and other countries have capitals 、 Population 、 Entities with features such as area can be abstracted as “ Country ” type

 

attribute （property）

An attribute is an abstraction of the relationship between entities , For example, Ang Lee is an entity , Ang Lee is a character （type）, The fantasy drifting of the youth school is an entity , The fantasy drift of youth school is a movie （type）, Obviously, there is a relationship between the two entities, that is ： Ang Lee → The director → The fantasy drifting of the youth school, so the relationship between Ang Lee and the fantasy drifting of the youth school can be attributed “ The director ” Characterization . Then you can build a layer of relationships based on attributes , figure （type）→ The director （property）→ The movie （type）.

 

Relationship （relation）

Relationship is the abstraction of the relationship between entities , Ang Lee （entity）→ The director （relation）→ The fantasy drifting of youth school （entity）, Direct this relation It describes the relationship between Ang Lee and the fantasy drifting of the youth School .

 

Domain （domain）

A domain is a collection of types , Above type , It is an abstraction of all types in a field , for example ： The country is to China 、 An abstraction of an entity like the United States , It's a type of , And a geographical location in addition to the type of country , There are other types ： City 、 Area 、 Chau, wait , And put all these types ： continent 、 Country 、 City 、 Regions and other types are abstracted , The geographical location domain is formed .

 

value （value）

Values are used to describe entities , It can be divided into text type and numerical type ,EG： Yao Ming （entity）→ height （relation）→226cm（value）.

According to the above concept , Build a basic map

Build a map from triples

From the picture 1 It can be concluded that

chart 1 Expression of knowledge

Alibaba is a company , A stock

Zhang Yong is a character

Alipay is a product .

alibaba.com CEO It's Zhang Yong

Alibaba's main product is Alipay

The number of Alibaba employees is 60000

 

The above is the most basic knowledge expression system , Companies will build knowledge bases for their businesses , Generally speaking , The basic knowledge expression concept will not change , In complex situations, the above knowledge expression system will be modified , Later articles will talk about . More complex businesses may involve “ state ”,“ action ”,“ State shift ” Etc ,freebase It doesn't really apply , Interested students can go and have a look " hypergraph ". stay freebase Based on the two-dimensional map of “ state ” The third dimension of ,“ action ” Of the fourth dimension , However, the construction will be better than freebase It's a lot more complicated .