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Note

Please see Azure Cognitive Services for Speech documentation for the latest supported speech solutions.

SrgsRuleRef Constructor (SrgsRule)

Initializes a new instance of the SrgsRuleRef class and specifies the rule to reference.

Namespace:  Microsoft.Speech.Recognition.SrgsGrammar
Assembly:  Microsoft.Speech (in Microsoft.Speech.dll)

Syntax

'Declaration
Public Sub New ( _
    rule As SrgsRule _
)
'Usage
Dim rule As SrgsRule

Dim instance As New SrgsRuleRef(rule)

public SrgsRuleRef(
    SrgsRule rule
)

Parameters

Exceptions

Exception Condition
ArgumentNullException

rule is a null reference (Nothing in Visual Basic).

Remarks

This constructor creates a rule reference to an SrgsRule object within the containing grammar. To create a rule reference to a rule element in an external grammar file, use any of the following constructors:

Examples

The following example creates a grammar that recognizes the phrase "A nation that has won the World Cup is" followed by the name of a country that has won the World Cup. After creating the SrgsRule object winnerRule and giving it the string identifier WorldCupWinner, the example appends the string "A nation that has won the World Cup is" to the rule. Using SrgsOneOf objects, the example then builds a list of European countries and a list of South American countries, and adds each list to its respective rule, ruleEurope or ruleSAmerica. The example then creates rule references for ruleEurope and ruleSAmerica and adds them to the WorldCupWinner rule.

public void WorldSoccerWinners ()
{

  // Create an SrgsDocument, create a new rule
  // and set its scope to public.
  SrgsDocument document = new SrgsDocument();
  SrgsRule winnerRule = new SrgsRule("WorldCupWinner");
  winnerRule.Scope = SrgsRuleScope.Public;

  // Add the introduction.
  winnerRule.Elements.Add(new SrgsItem("A nation that has won the world cup is: "));

  // Create the rule for the European nations.
  SrgsOneOf oneOfEurope = new SrgsOneOf(new SrgsItem[] {new SrgsItem("England"), 
    new SrgsItem("France"), new SrgsItem("Germany"), new SrgsItem("Italy")});
  SrgsRule ruleEurope = (new SrgsRule("EuropeanNations", new SrgsElement[] {oneOfEurope}));

  // Create the rule for the South American nations.
  SrgsOneOf oneOfSAmerica = new SrgsOneOf(new SrgsItem[] {new SrgsItem("Argentina"), 
    new SrgsItem("Brazil"), new SrgsItem("Uruguay")});
  SrgsRule ruleSAmerica = (new SrgsRule("SouthAmericanNations", new SrgsElement[] {oneOfSAmerica}));

  // Add references to winnerRule for ruleEurope and ruleSAmerica.
  winnerRule.Elements.Add(new SrgsOneOf(new SrgsItem[] {(new SrgsItem 
    (new SrgsRuleRef(ruleEurope))), new SrgsItem(new SrgsRuleRef(ruleSAmerica))}));

  // Add all the rules to the document and make winnerRule 
  // the root rule of the document.
  document.Rules.Add(new SrgsRule[] {winnerRule, ruleEurope, ruleSAmerica});
  document.Root = winnerRule;
}

The created grammar has the following form.

<grammar version="1.0" xml:lang="en-US" xmlns="http://www.w3.org/2001/06/grammar" root="WorldCupWinner">
    <rule id="WorldCupWinner" scope="public">
        <item> A nation that has won the world cup is </item>
        <one-of>
            <item>
                <ruleref uri="#EuropeanNations" />
            </item>
            <item>
                <ruleref uri="#SouthAmericanNations" />
            </item>
        </one-of>
    </rule>
    <rule id="EuropeanNations">
        <one-of>
            <item> England </item>
            <item> France </item>
            <item> Germany </item>
            <item> Italy </item>
        </one-of>
    </rule>
    <rule id="SouthAmericanNations">
        <one-of>
            <item> Argentina </item>
            <item> Brazil </item>
            <item> Uruguay </item>
        </one-of>
    </rule>
</grammar>

See Also

Reference

SrgsRuleRef Class

SrgsRuleRef Members

SrgsRuleRef Overload

Microsoft.Speech.Recognition.SrgsGrammar Namespace

Other Resources

Create Grammars Using SrgsGrammar (Microsoft.Speech)