content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.beam.sdk.schemas.transforms;
  
  import org.apache.beam.sdk.annotations.Internal;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PCollectionRowTuple;
  
  /**
   * An abstraction representing schema capable and aware transforms. The interface is intended to be
   * used in conjunction with the interface {@link SchemaTransformProvider}.
   *
   * <p>The interfaces can be implemented to make transforms available in other SDKs in addition to
   * Beam SQL.
   *
   * <p><b>Internal only:</b> This interface is actively being worked on and it will likely change as
   * we provide implementations for more standard Beam transforms. We provide no backwards
   * compatibility guarantees and it should not be implemented outside of the Beam repository.
   */
  @Internal
  public abstract class SchemaTransform
      extends PTransform<PCollectionRowTuple, PCollectionRowTuple> {}
  