public com.google.cloud.vision.v1.ProductSet.Builder addProductSetsBuilder() {
      return getProductSetsFieldBuilder()
          .addBuilder(com.google.cloud.vision.v1.ProductSet.getDefaultInstance());
    }
<pre>
List of ProductSets.
</pre>

<code>repeated .google.cloud.vision.v1.ProductSet product_sets = 1;</code>
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ListProductSetsResponse.java