Speech semantics example?

Anyone have a sample grammar that includes semantics and works in Unity (2018.3)?
I haven't been able to cobble together a working example.

Mike

 

I'm stumped. Here's my grammar (example from web) and script. I don't get any recognition events unless the semantic tags are removed. Status of the recognizer is "running" either way.

Could use a good reference for creating semantic tags as well.

<?xml version="1.0" encoding="UTF-8" ?>

<grammar xmlns="http://www.w3.org/2001/06/grammar"

        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"

        xml:lang="en"

        version="1.0" mode="voice" root="main">



   <rule id="main">

       <one-of>

           <item><ruleref uri="#rule1" /></item>

       </one-of>

   </rule>

 

   <rule id="rule1" scope="public">

        <one-of>

             <item>1<tag>out.start="1";</tag></item>

             <item>2<tag>out.start="2";</tag></item>

             <item>3<tag>out.start="3";</tag></item>

        </one-of>

   </rule>



</grammar>

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.IO;
5.  
6. using UnityEngine;
7. using UnityEngine.Windows.Speech;
8.  
9.  
10. public class SpeechGrammarTest : MonoBehaviour
11. {
12.     public string grammarPath;
13.     [Header("Read Only")]
14.     public string dateTime;
15.     public string fullPath;
16.     public bool running;
17.     public string utterance;
18.     public List<string> semantics;
19.  
20.     GrammarRecognizer recognizer;
21.  
22.     // Start is called before the first frame update
23.     void Start()
24.     {
25.         fullPath = Path.Combine(Application.streamingAssetsPath, grammarPath);
26.         recognizer = new GrammarRecognizer(fullPath, ConfidenceLevel.Low);
27.         recognizer.OnPhraseRecognized += PhraseRecognized;
28.         recognizer.Start();
29.         running = recognizer.IsRunning;
30.     }
31.  
32.     public bool hasSemantics = false;
33.  
34.     private void PhraseRecognized(PhraseRecognizedEventArgs args)
35.     {
36.         utterance = args.text;
37.  
38.         hasSemantics = args.semanticMeanings != null;
39.         semantics.Clear();
40.         if (args.semanticMeanings != null)
41.         {
42.             foreach (SemanticMeaning sm in args.semanticMeanings)
43.             {
44.                 string newSm = sm.key;
45.                 foreach (string val in sm.values)
46.                     newSm = newSm + " " + val;
47.                 semantics.Add(newSm);
48.             }
49.         }
50.     }
51.  
52.     // Update is called once per frame
53.     void Update()
54.     {
55.         dateTime = System.DateTime.Now.ToString();
56.     }
57. }
58.  

 

I think I've figured it out.
The grammar header must have a tag-format declaration if you're doing semantic interpretation. So, the last line of the grammar node should be

version="1.0" mode="voice" tag-format="semantics/1.0" root="main">

Found the issue when I tried to load the grammar into a regular MS speech grammar (non-Unity) and it threw an error.
Hopefully, this can help someone else.

Good resources here.
https://www.w3.org/TR/speech-grammar/
https://www.w3.org/TR/semantic-interpretation/