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/usr/share/gtksourceview-2.0/language-specs/gtk-doc.lang is in libgtksourceview2.0-common 2.10.5-2ubuntu2.

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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: Yevgen Muntyan <muntyan@tamu.edu>
 Copyright (C) 2006-2007 Yevgen Muntyan <muntyan@tamu.edu>

 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.

-->
<!-- Copyright (C) 2006-2007 - Yevgen Muntyan <muntyan@tamu.edu> -->
<language id="gtk-doc" _name="gtk-doc" version="2.0" _section="Markup" hidden="true">
    <styles>
        <style id="inline-docs-section" _name="Inline Documentation Section" map-to="def:doc-comment"/>
        <style id="function-name" _name="Function Name" map-to="def:doc-comment-element"/>
        <style id="signal-name" _name="Signal Name" map-to="def:doc-comment-element"/>
        <style id="property-name" _name="Property Name" map-to="def:doc-comment-element"/>
        <style id="parameter" _name="Parameter" map-to="def:doc-comment-element"/>
        <style id="constant" _name="Constant" map-to="def:doc-comment-element"/>
        <style id="type" _name="Type" map-to="def:doc-comment-element"/>
        <style id="function" _name="Function" map-to="def:doc-comment-element"/>
        <style id="return" _name="Return" map-to="def:doc-comment-element"/>
        <style id="since" _name="Since" map-to="def:doc-comment-element"/>
        <style id="deprecated" _name="Deprecated" map-to="def:doc-comment-element"/>
    </styles>

    <definitions>
      <context id="skip-asterisk">
        <match>^\s*\*(?!/)\s*</match>
      </context>

      <context id="inline-docs-body">
        <include>
          <context ref="skip-asterisk"/>
          <context ref="def:in-comment"/>
          <context style-ref="parameter">
            <match>\@[\w_]+</match>
          </context>
          <context style-ref="constant">
            <match>%[\w_]+</match>
          </context>
          <context style-ref="type">
            <match>\#[\w_]+</match>
          </context>
          <context style-ref="function">
            <match>[\w_]+\(\s*\)</match>
          </context>
          <context style-ref="return">
            <match>(Returns|Return value)\:</match>
          </context>
          <context style-ref="since">
            <match>Since\:</match>
          </context>
          <context style-ref="deprecated">
            <match>Deprecated\:</match>
          </context>
        </include>
      </context>

      <context id="inline-docs-section" style-ref="inline-docs-section" class-disabled="no-spell-check">
        <start>/\*\*(?!\S)</start>
        <end>\*/</end>
        <include>
          <context ref="skip-asterisk"/>
          <context extend-parent="false">
            <start>(([\w_]+\:\:[\w_-]+)|([\w_]+\:[\w_-]+)|([\w_]+))\:\s*$</start>
            <include>
              <context sub-pattern="2" where="start" style-ref="function-name"/>
              <context sub-pattern="3" where="start" style-ref="signal-name"/>
              <context sub-pattern="4" where="start" style-ref="property-name"/>
              <context ref="inline-docs-body"/>
            </include>
          </context>
          <context ref="inline-docs-body"/>
        </include>
      </context>
    </definitions>
</language>