public Builder setAbnfGrammar(com.google.cloud.speech.v1.SpeechAdaptation.ABNFGrammar value) {
      if (abnfGrammarBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        abnfGrammar_ = value;
      } else {
        abnfGrammarBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Augmented Backus-Naur form (ABNF) is a standardized grammar notation
comprised by a set of derivation rules.
See specifications: https://www.w3.org/TR/speech-grammar
</pre>

<code>.google.cloud.speech.v1.SpeechAdaptation.ABNFGrammar abnf_grammar = 4;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/SpeechAdaptation.java