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Many software languages (and programming languages, in particular) are described simultaneously by multiple grammars that are found in different software artifacts. For instance, one grammar may reside in a language specification; another grammar may be encoded in a parser specification; yet another grammar may be present in an XML schema for tool-independent data exchange. Ideally, one would want to reliably establish and continuously maintain that all co-existing (potentially embedded) grammars describe the same intended language. Without such guarantee, grammar inconsistencies may go unnoticed, and grammar-based software artifacts may get brittle.
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