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==Computing== ===File formats=== * [[Simple Data Format]], for binary data * [[Spatial Data File]], for geodatabases * [[Standard Delay Format]], for timing data * [[SQL Server Compact Edition Database File]] (filename extension: <code>.sdf</code>) * [[Structure data file]], for chemical tables * Scientific Data Format, a [[Hierarchical Data Format]] implementation ===Formal computer science=== * [[Signed distance function]] (or field), in mathematical applications * [[Syntax Definition Formalism]], to describe formal languages ===Other uses in computing=== * Software development folder, a physical or virtual container for software project artifacts * [[Synchronous Data Flow]], a restriction of Kahn process networks * [[SDF Public Access Unix System]], a shared shell provider
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