The Syntax Definition Formalism ( SDF ) is a metasyntax used to define context-free grammars : that is, a formal way to describe formal languages. It can express the entire range of context-free grammars . Its current version is SDF3. A parser and parser generator for SDF specifications are provided as part of the free ASF+SDF Meta Environment . These operate using the SGLR ( Scannerless GLR parser ). An SDF parser outputs parse trees or, in the case of ambiguities , parse forests.
2-512: (Redirected from SDF-2 ) SDF2 or variants may refer to: Syntax Definition Formalism 2, in computer science SDF-2 Megaroad-01 , a fictional spaceship from the Japanese series Macross Screen Definition Facility II (SDF II), a software tool from IBM SDF2, an Amazon locations [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with
4-565: The same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=SDF2&oldid=1211635652 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Syntax Definition Formalism Features of SDF: The following example defines
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