[PATCH] Add "--xml" support to "svn diff --summarize" (Issue 2967)

Hi All,
    Attached is a patch that adds "--xml" support for "svn diff
--summarize". This patch includes the actual work adding this
feature, unit tests and the Relax-NG schema file for the output. Here
is an example of the usage:

$ svn diff --summarize --xml -r27285:HEAD
<?xml version="1.0"?>
<diff>
<paths>
<path
   props="none"
   kind="file"
   item="modified">subversion/libsvn_client/merge.c</path>
<path
   props="none"
   kind="file"
   item="modified">subversion/tests/cmdline/update_tests.py</path>
<path
   props="none"
   kind="file"
   item="modified">subversion/po/zh_CN.po</path>
<path
   props="none"
   kind="file"
   item="modified">contrib/client-side/svn-merge-vendor.py</path>
</paths>
</diff>

As expected, below is the commit log for the suggested patch.

Take care,

Jeremy

[[[
Add "--xml" support to "svn diff --summarize". (Issue 2967)

* subversion/tests/cmdline/diff_tests.py
  (diff_summarize_xml): Created unit test to test "--xml" flag functionality.
  (test_list): Added diff_summarize_xml to the list of tests to run for diff.

* subversion/tests/cmdline/svntest/actions.py
  (run_and_verify_diff_summarize_xml): Added a convenience function
  for testing the new "--xml" flag funtionality.

* subversion/svn/diff-cmd.c
  (kind_to_char): Refactored text_mod_char to kind_to_char for readability.
  Translates a svn_client_diff_summarize_kind_t into a char representation.
  (kind_to_word): Translates a svn_client_diff_summarize_kind_t to a word
  representation.
  (summarize_func_xml): New function for outputting the "diff --summarize"
  in XML format.
  (summarize_func): Updated to use kind_to_char instead of text_mod_char.
  (svn_cl__diff): Added logic to handle the "--xml" flag.

* subversion/svn/schema/diff.rnc
  (added to version control): This is the Relax-NG schema for the XML output.

* subversion/svn/main.c
  (svn_cl__cmd_table): Updated to have the diff command support the
  passing of the "--xml" flag.
]]]

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