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/usr/share/gtksourceview-3.0/language-specs/mxml.lang is in libgtksourceview-3.0-common 3.18.2-1.

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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"?>
<!--

 This file is part of GtkSourceView

 Authors: Markus Johnsson
 Copyright (C) 2008 Markus Johnsson <markus.johnsson.84@gmail.com>

 GtkSourceView is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 GtkSourceView 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
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

-->
<language id="mxml" _name="MXML" version="2.0" _section="Markup">
  <metadata>
    <property name="globs">*.mxml</property>
    <property name="block-comment-start">&lt;!--</property>
    <property name="block-comment-end">--&gt;</property>
  </metadata>

  <styles>
    <style id="element-name" _name="Element name" map-to="xml:element-name"/>
    <style id="cdata-delim" _name="CDATA delimiter" map-to="xml:cdata-delim"/>
  </styles>

  <definitions>
    <context id="actionscript">
      <start>&lt;(fx:Script|mx:Script)&gt;</start>
      <end>&lt;/\%{1@start}&gt;</end>

      <include>
        <context sub-pattern="0" where="start" style-ref="element-name"/>
        <context sub-pattern="0" where="end" style-ref="element-name"/>
        <context ref="xml:element-name"/>
        <context id="actionscript-code" extend-parent="false">
          <start>&lt;!\[CDATA\[</start>
          <end>\]\]&gt;</end>
          <include>
            <context sub-pattern="0" where="start" style-ref="cdata-delim"/>
            <context sub-pattern="0" where="end" style-ref="cdata-delim"/>
            <context ref="actionscript:actionscript"/>
          </include>
        </context>
      </include>
    </context>

    <context id="mxml">
      <include>
        <context ref="actionscript"/>
        <context ref="xml:xml"/>
      </include>
    </context>

  </definitions>
</language>