Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Speech Recognition Grammar Specification (SRGS) is a W3C standard for how speech recognition grammars are specified. A speech recognition grammar is a set of word patterns, and tells a speech recognition system what to expect a human to say. For instance, if you call a voice directory application, it will prompt you for the name of the person you would like to talk with. It will then start up a speech recognizer, giving it a speech recognition grammar. This grammar contains the names of the people in the directory, and the various sentence patterns callers typically respond with. SRGS specifies two alternate but logically equivalent syntaxes, one based on XML, and one using Augmented BNF format. In practice, the XML syntax is used more frequently. If the speech recognizer returned just a string containing the actual words spoken by the user, the voice application would have to do the tedious job of extracting the semantic meaning from those words. For this reason, SRGS grammars can be decorated with tag elements, which when executed, build up the semantic result.
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