public Builder setAbnfGrammar(
        com.google.cloud.speech.v1p1beta1.SpeechAdaptation.ABNFGrammar.Builder builderForValue) {
      if (abnfGrammarBuilder_ == null) {
        abnfGrammar_ = builderForValue.build();
      } else {
        abnfGrammarBuilder_.setMessage(builderForValue.build());
      }
      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.v1p1beta1.SpeechAdaptation.ABNFGrammar abnf_grammar = 4;</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/SpeechAdaptation.java