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Showing Child-Items Count in hierarchical SharePoint Lists with multiple content-types
SharePoint 2007 introduced content-types to template standard record definitions and re-use them across lists, such as Task, Issue, or even Folder. Multiple such content-types can be set associated to a single list. A folder is a content-type as well, and it can not only have child items/files within it but also have extended columns just like any item. This allows interesting scenario's where-by instead of using Lookups to setup relationship of items spread across lists one can implicitly set master-detail relationship on items within same lists.