Pro SharePoint 2013 Administration - EBook Free Download

Chapter 9 ■ Content Model and Managed MetadataThere is a difference between centrally managed site columns and list columns. When creating a custom list,the user may define columns specifically for the new list, meaning the columns bind only to that list. By contrast, sitecolumns reside in the Site Column Gallery, and users may reuse these columns in lists (add an existing column) andcontent types.Content types may inherit from other content types at the same level in the site hierarchy or a parent level. Eventhe most basic content types at least inherit from the stock Item content type, which contains the Title site column.Through inheritance, users may customize content types by defining new types that have the same columns as the parent,with additional columns to complete the specialization. For example, if you want to customize task list items with newcolumns, rather than creating a new content type, you can inherit the existing Task content type and add the new customcolumns. Inheritance provides the added benefit that any changes to a parent content type apply to content subtypes.■ ■Note Never change stock content types and site columns; always inherit from content types, and then specialize.New Content Type Model FunctionalitySharePoint has included lists, libraries, content types, site columns, and list columns since SharePoint 2007. However,each version of SharePoint has brought change to content types. Following are some of the more noteworthy features,beyond the basic content type behavior (described previously). Microsoft introduced many of the following features inSharePoint 2010, which of course also exist in SharePoint 2013.• Content types and lists that use lookup site columns may specify additional columns of thelookup list to include, in addition to the primary lookup column.• SharePoint includes referential integrity in lookup columns. For example, when you deletea list item from a list, referenced by a lookup column, SharePoint will delete the dependentlist item, prevent the deletion of the parent, or do nothing, depending on a referentialintegrity setting.• Document sets (a special content type) allow collection of documents in one list item. Theyare ideal for collecting multiple documents that combine to a single finished entity, such asa proposal.• A Managed Metadata column type that maps to term sets in the Managed Metadata ServiceTerm Store exists.• An Enterprise Keywords column allows users to add their own tags (folksonomy) as part of theManaged Metadata Service.• Since SharePoint 2010, users can now share content types across site collections viaa centralized content type hub.• SharePoint includes columns and content types to access external data via the BusinessConnectivity Service.• SharePoint includes a Rating site column.• Since SharePoint 2010, SharePoint includes advanced routing of documents via ContentOrganizer and policy rules.280www.it-ebooks.info