/**
 * @copyright
 * ====================================================================
 *    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.
 * ====================================================================
 * @endcopyright
 *
 * @file svn_diff.h
 * @brief Contextual diffing.
 *
 * This is an internalized library for performing contextual diffs
 * between sources of data.
 *
 * @note This is different than Subversion's binary-diffing engine.
 * That API lives in @c svn_delta.h -- see the "text deltas" section.  A
 * "text delta" is way of representing precise binary diffs between
 * strings of data.  The Subversion client and server send text deltas
 * to one another during updates and commits.
 *
 * This API, however, is (or will be) used for performing *contextual*
 * merges between files in the working copy.  During an update or
 * merge, 3-way file merging is needed.  And 'svn diff' needs to show
 * the differences between 2 files.
 *
 * The nice thing about this API is that it's very general.  It
 * operates on any source of data (a "datasource") and calculates
 * contextual differences on "tokens" within the data.  In our
 * particular usage, the datasources are files and the tokens are
 * lines.  But the possibilities are endless.
 */

