Semantic Interpretation for Speech Recognition

<?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"> <grammar xmlns="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">    <rule id="order">       Ich hätte gerne eine       <ruleref uri="#drink"/>       <tag>out.drink = new Object(); out.drink.liquid=rules.drink.type;            out.drink.drinksize=rules.drink.drinksize;</tag>       und       <ruleref uri="#pizza"/>       <tag>out.pizza=rules.pizza;</tag>    </rule>    <rule id="kindofdrink">       <one-of>          <item>coke</item>          <item>pepsi</item>          <item>coca cola<tag>out="coke";</tag></item>       </one-of>    </rule>    <rule id="foodsize">       <tag>out="medium";</tag> <!-- "medium" is default if nothing said -->       <item repeat="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 -->    <rule id="tops">       <tag>out=new Array;</tag>       <ruleref uri="#top"/>       <tag>out.push(rules.top);</tag>       <item repeat="1-">          and          <ruleref uri="#top"/>          <tag>out.push(rules.top);</tag>       </item>    </rule>    <rule id="top">       <one-of>          <item>anchovies</item>          <item>peperoni</item>          <item>mushroom<tag>out="mushrooms";</tag></item>          <item>mushrooms</item>       </one-of>    </rule>    <!-- Two properties (drinksize, type) on left hand side Rule Variable -->    <rule id="drink">       <ruleref uri="#foodsize"/>       <ruleref uri="#kindofdrink"/>       <tag>out.drinksize=rules.foodsize; out.type=rules.kindofdrink;</tag>    </rule>    <!-- Three properties on rules.pizza -->    <rule id="pizza">       <ruleref uri="#number"/>       <ruleref uri="#foodsize"/>       <tag>out.pizzasize=rules.foodsize; out.number=rules.number;</tag>       pizzas with       <ruleref uri="#tops"/>       <tag>out.topping=rules.tops;</tag>    </rule>    <rule id="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>