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If you are not familiar with database table data management through Info and Provider classes, we strongly recommend that you refer to the Database table API topic first.
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 Please note 
 The classes of page templates can be found in the CMS.PortalEngine namespace. | 
•PageTemplateCategoryInfo - represents one page template category.
•PageTemplateCategoryInfoProvider - provides management functionality for page template categories.
•PageTemplateInfo - represents one page template object.
•PageTemplateInfoProvider - provides management functionality for page templates.
•PageTemplateSiteInfo - represents a relationship between a page template and a site.
•PageTemplateSiteInfoProvider - provides management functionality for page template-site relationships.
•PageTemplateScopeInfo - represents one page template scope.
•PageTemplateScopeInfoProvider - provides management functionality for page template scopes.
•PageTemplateInstance - represents a specific instance of a page template.