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/usr/share/gtksourceview-2.0/language-specs/po.lang is in libgtksourceview2.0-common 2.10.5-1ubuntu2.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--

 Author: Paolo Maggi
 Copyright (C) 2003 Paolo Maggi

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Library General Public
 License as published by the Free Software Foundation; either
 version 2 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Library General Public License for more details.

 You should have received a copy of the GNU Library General Public
 License along with this library; if not, write to the
 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.

-->
<language id="gettext-translation" _name="gettext translation" version="2.0" _section="Others">
  <metadata>
    <property name="mimetypes">text/x-po;text/x-pot;text/x-pox;text/x-gettext-translation;text/x-gettext-translation-template</property>
    <property name="globs">*.po;*.pot</property>
    <property name="line-comment-start">#</property>
  </metadata>

  <styles>
    <style id="comment" _name="Comment" map-to="def:comment"/>
    <style id="location" _name="Location" map-to="def:comment"/>
    <style id="string" _name="String" map-to="def:string"/>
    <style id="fuzzy" _name="Fuzzy" map-to="def:note"/>
    <style id="keyword" _name="Keyword" map-to="def:keyword"/>
    <!-- FIXME make it some nice name and mark it translatable -->
    <style id="special" _name="Special" map-to="def:special-char"/>
  </styles>

  <definitions>
    <context id="string" style-ref="string" class="string" class-disabled="no-spell-check">
      <start>"</start>
      <end>"</end>
      <include>
        <context ref="def:escape"/>
        <context ref="def:line-continue"/>
        <context ref="def:email-address"/>
        <context ref="def:net-address"/>
        <context id="mnemonic" style-ref="special">
          <match>[&amp;_][a-zA-Z]</match>
        </context>
        <context id="tag" style-ref="special">
	  <match>&lt;[a-zA-Z\=\"\/ ]+&gt;</match>
	</context>
        <context ref="python:format" style-ref="special"/>
        <context ref="c:printf" style-ref="special"/>
      </include>
    </context>
    <context id="format" style-ref="comment" end-at-line-end="true">
      <start>^#,</start>
      <include>
        <context ref="def:escape"/>
        <context ref="def:line-continue"/>
        <context id="fuzzy" style-ref="fuzzy">
          <match>\bfuzzy\b</match>
        </context>
      </include>
    </context>
    <context id="location" style-ref="location" end-at-line-end="true">
      <start>^#:</start>
      <include>
        <context ref="def:escape"/>
        <context ref="def:line-continue"/>
      </include>
    </context>
    <context id="keyword" style-ref="keyword">
      <prefix>^</prefix>
      <keyword>domain</keyword>
      <keyword>msgid</keyword>
      <keyword>msgid_plural</keyword>
      <keyword>msgstr</keyword>
      <keyword>msgctxt</keyword>
    </context>
    <context id="gettext-translation" class="no-spell-check">
      <include>
        <context ref="string"/>
        <context ref="format"/>
        <context ref="location"/>
        <context ref="def:shell-like-comment" style-ref="comment"/>
        <context ref="keyword"/>
      </include>
    </context>
  </definitions>
</language>