private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.Partition,
            com.google.cloud.visionai.v1.Partition.Builder,
            com.google.cloud.visionai.v1.PartitionOrBuilder>
        getPartitionFieldBuilder() {
      if (partitionBuilder_ == null) {
        partitionBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.Partition,
                com.google.cloud.visionai.v1.Partition.Builder,
                com.google.cloud.visionai.v1.PartitionOrBuilder>(
                getPartition(), getParentForChildren(), isClean());
        partition_ = null;
      }
      return partitionBuilder_;
    }
<pre>
Partition information in time and space for the sub-asset level annotation.
</pre>

<code>.google.cloud.visionai.v1.Partition partition = 3;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UserSpecifiedAnnotation.java