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RaviKumarRaviKumar 

Knowledge article, Case Article, Case, Data Categories

What is Knowledge article, Case Article, Case, Data Categories?
How these related to each other? What type of relation between them?

Are they Objects or what?
Can i use apex to get records of each?

 
Shashikant SharmaShashikant Sharma
Knowledge article - Provides read-only access to an article and the ability to delete the master article. This object is available in API version 19.0 and later. read this - https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_knowledgearticle.htm#sforce_api_objects_knowledgearticle

Case Article - Represents the association between a Case and a KnowledgeArticle. This object is available in API version 20.0 and later.
Read this - https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_casearticle.htm

Case - A customer issue such as a customer’s feedback, problem, or question. https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_case.htm#topic-title

Data Categories - Data categories can be used by Salesforce Knowledge (articles and article translations) and Answers, and Chatter Answers to help users classify and find articles or questions. Administrators can use data categories to control access to articles and questions

Read -  https://help.salesforce.com/HTViewHelpDoc?id=category_whatis.htm&language=en_US (https://help.salesforce.com/HTViewHelpDoc?id=category_whatis.htm&language=en_US)

Yes they are objects. Yes you could use them in Apex.

Thanks
Shashikant