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If you are not familiar with the database table data management by Info and Provider classes, we strongly recommend that you refer to the Database table API topic first.
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 Please note 
 The Categories module classes use the CMS.SiteProvider namespace. 
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•CategoryInfo - represents one category.
•CategoryInfoProvider - provides management of categories.
•DocumentCategoryInfo - represents relationships between one document and one category expressing that the particular document is added to the particular category.
•DocumentCategoryInfoProvider - provides management of relationships between documents and categories.