@java.lang.Override
  public Builder newBuilderForType() {
    return newBuilder();
  }
<pre>
The next_page_token returned from a previous List request, if any.
</pre>

<code>string next_page_token = 3;</code>

@return The bytes for nextPageToken.
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/ListReferenceImagesResponse.java