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SDF is a language for defining syntax. It provides for an unprecedented level of conciseness in syntax definitions. First, syntax can be defined in modules. Second, lexical and context-free syntax are integrated in a single formalism in which the complete syntax of a language can be defined. Third, SDF includes declarative disambiguation constructs. Therefore, there is no need to introduce non-terminals to deal with ambiguities in a language. Some useful places to start: * An [[SdfLanguage][overview]] of the unique features of SDF * Pointers to SDF [[SdfDocumentation][documentation]] * [[SdfSoftware][Download]] the implementation of SDF * [[SdfPublications][Research papers]] about SDF * [[SdfGrammars][Find SDF grammars for many languages here]] * Subscribe to the [[MailingList][mailing list]] for announcements and discussions. * Organization of the [[SdfDevelopment][development]] of SDF related software * How to [[SdfBugs][report bugs]].