WinFS ( short for Windows Future Storage ) is the code name for a cancelled data storage and management system project based on relational databases, developed by Microsoft and first demonstrated in 2003 as an advanced storage subsystem for the Microsoft Windows operating system, designed for persistence and management of structured, semi-structured as well as unstructured data.

WinFS aimed at providing a shared data model | schema system that would enable such a scenario.

While WinFS and its shared type schema make it possible for an application to recognize the different data types, the application still has to be coded to render the different data types.

Consequently, it would not allow development of a single application that can view or edit all data types ; rather what WinFS enables applications to understand is the structure of all data and extract the information that it can use further.

WinFS aims to provide such a data model and the runtime infrastructure that can be used to store the data, as well as the relationships between data items according to the data model, doing so at a satisfactory level of performance.

WinFS natively recognizes different types of data, such as picture, e-mail, document, audio, video, calendar, contact, among others ; rather than just leaving them as raw unanalyzed bytestreams ( as most file systems do ).

Data stored and managed by the system are instances of the data type recognized by the WinFS runtime.

Besides that, WinFS also allows different data instances to be related together, such as a document and a contact can be related by an Authored By relationship.

WinFS promotes sharing of data between applications by making the data types accessible to all applications, along with their schemas.

So any application, when it wants to use a WinFS type, by using the schema can find out the structure of the data and utilize the information.

The WinFS API further abstracts the task of accessing data.

All WinFS types are exposed as. NET objects with the properties of the object directly mapping to the properties of the data type.

Also, by letting different applications which deal with the same data share the same WinFS data instance rather than storing the same data in different files, the hassles of synchronizing the different stores when the data change are removed.

Access to all the data in the system allows complex searches for data to be performed across all the data items managed by WinFS.

WinFS includes mappings for object and XML schemas by default ; mappings for other schemas needs to be specified.

Object schemas are specified using XML ; WinFS generates code to surface the schemas as. NET classes.

WinFS includes a relational database for storage of information, and allows any type of information to be stored in it, provided there is a well defined schema for the type.

Internally, WinFS uses a relational database to manage data.

The WinFS runtime maps the schema to a relational modality, by defining the tables it will store the types in and the primary keys and foreign keys that would be required to represent the relationships.

Parts of Cairo have still not made it into Windows as of 2009-specifically, the WinFS file system, which was the much touted Object File System of Cairo.

At the 2010 SQL Server PASS Community Summit, the forthcoming version of SQL Server (" Denali ") was shown, which seems to incorporate many of the WinFS ideas.

Microsoft announced that they have discontinued the separate release of WinFS for Windows XP and Windows Vista and will gradually incorporate the technologies developed for WinFS in other products and technologies, notably Microsoft SQL Server.

When WinFS was introduced at the 2003 Professional Developers Conference, Microsoft also released a video presentation, named IWish, showing mockup interfaces that showed how applications would expose interfaces that take advantage of a unified type system.

WinFS was billed as one of the pillars of the " Longhorn " wave of technologies, and would ship as part of the next version of Windows.

It was subsequently decided that WinFS would ship after the release of Windows Vista, but those plans were shelved in June 2006, with some of its component technologies being integrated into upcoming releases of ADO. NET and Microsoft SQL Server.

While it was then assumed by observers that WinFS was finished as a project, in November 2006 Steve Ballmer announced that WinFS was still in development, though it was not clear how the technology was to be delivered.

Thus WinFS can reduce redundancies.

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