public Builder setCrossingLine(com.google.cloud.visionai.v1.NormalizedPolyline value) {
      if (crossingLineBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        annotationPayload_ = value;
        onChanged();
      } else {
        crossingLineBuilder_.setMessage(value);
      }
      annotationPayloadCase_ = 6;
      return this;
    }
<pre>
Annotation for type CROSSING_LINE
</pre>

<code>.google.cloud.visionai.v1.NormalizedPolyline crossing_line = 6;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/StreamAnnotation.java