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Semantic Interpretation for Speech Recognition (SISR) defines the syntax and semantics of annotations to grammar rules in theSpeech Recognition Grammar Specification (SRGS). Since 5 April 2007, it is aWorld Wide Web Consortium recommendation.[1]
By building upon SRGS grammars, it allowsvoice browsers viaECMAScript to semantically interpret complex grammars and provide the information back to the application. For example, it allows utterances like "I would like a Coca-cola and three large pizzas withpepperoni and mushrooms." to be interpreted into an object that can be understood by an application. For example, the utterance could produce the following object namedorder:
{drink:{liquid:"coke",drinksize:"medium"},pizza:{number:"3",pizzasize:"large",topping:["pepperoni","mushrooms"]}}
If used against this grammar that includes SISR markup in addition to the standard SRGS grammar in XML format:
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE grammar PUBLIC "-//W3C//DTD GRAMMAR 1.0//EN" "http://www.w3.org/TR/speech-grammar/grammar.dtd"><grammarxmlns="http://www.w3.org/2001/06/grammar"xml:lang="en"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.w3.org/2001/06/grammar http://www.w3.org/TR/speech-grammar/grammar.xsd"version="1.0"mode="voice"tag-format="semantics/1.0"root="order"><ruleid="order">Iwouldlikea<rulerefuri="#drink"/><tag>out.drink=newObject();out.drink.liquid=rules.drink.type;out.drink.drinksize=rules.drink.drinksize;</tag>and<rulerefuri="#pizza"/><tag>out.pizza=rules.pizza;</tag></rule><ruleid="kindofdrink"><one-of><item>coke</item><item>pepsi</item><item>cocacola<tag>out="coke";</tag></item></one-of></rule><ruleid="foodsize"><tag>out="medium";</tag><!-- "medium" is default if nothing said --><itemrepeat="0-1"><one-of><item>small<tag>out="small";</tag></item><item>medium</item><item>large<tag>out="large";</tag></item><item>regular<tag>out="medium";</tag></item></one-of></item></rule><!-- Construct Array of toppings, return Array --><ruleid="tops"><tag>out=newArray;</tag><rulerefuri="#top"/><tag>out.push(rules.top);</tag><itemrepeat="1-">and<rulerefuri="#top"/><tag>out.push(rules.top);</tag></item></rule><ruleid="top"><one-of><item>anchovies</item><item>pepperoni</item><item>mushroom<tag>out="mushrooms";</tag></item><item>mushrooms</item></one-of></rule><!-- Two properties (drinksize, type) on left hand side Rule Variable --><ruleid="drink"><rulerefuri="#foodsize"/><rulerefuri="#kindofdrink"/><tag>out.drinksize=rules.foodsize;out.type=rules.kindofdrink;</tag></rule><!-- Three properties on rules.pizza --><ruleid="pizza"><rulerefuri="#number"/><rulerefuri="#foodsize"/><tag>out.pizzasize=rules.foodsize;out.number=rules.number;</tag>pizzaswith<rulerefuri="#tops"/><tag>out.topping=rules.tops;</tag></rule><ruleid="number"><one-of><item><tag>out=1;</tag><one-of><item>a</item><item>one</item></one-of></item><item>two<tag>out=2;</tag></item><item>three<tag>out=3;</tag></item></one-of></rule></grammar>