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/usr/share/lttoolbox/dix.rng is in lttoolbox-dev 3.3.3~r68466-2.

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<?xml version="1.0" encoding="UTF-8"?>
<!--
  Copyright (C) 2005 Universitat d'Alacant / Universidad de Alicante
  
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.
  
  This program 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
  General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program; if not <http://www.gnu.org/licenses/>.
  
     DTD for the format of dictionaries
-->
<grammar xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <define name="dictionary">
    <element name="dictionary">
      <ref name="attlist.dictionary"/>
      <optional>
        <ref name="alphabet"/>
      </optional>
      <optional>
        <ref name="sdefs"/>
      </optional>
      <optional>
        <ref name="pardefs"/>
      </optional>
      <oneOrMore>
        <ref name="section"/>
      </oneOrMore>
    </element>
  </define>
  <define name="attlist.dictionary" combine="interleave">
    <empty/>
  </define>
  <!--  root element -->
  <define name="alphabet">
    <element name="alphabet">
      <ref name="attlist.alphabet"/>
      <text/>
    </element>
  </define>
  <define name="attlist.alphabet" combine="interleave">
    <empty/>
  </define>
  <!-- alphabetic character list -->
  <define name="sdefs">
    <element name="sdefs">
      <ref name="attlist.sdefs"/>
      <oneOrMore>
        <ref name="sdef"/>
      </oneOrMore>
    </element>
  </define>
  <define name="attlist.sdefs" combine="interleave">
    <empty/>
  </define>
  <!-- symbol definition section -->
  <define name="sdef">
    <element name="sdef">
      <ref name="attlist.sdef"/>
      <empty/>
    </element>
  </define>
  <!-- symbol definition -->
  <define name="attlist.sdef" combine="interleave">
    <attribute name="n">
      <data type="ID"/>
    </attribute>
  </define>
  <!-- n: symbol (tag) name -->
  <define name="attlist.sdef" combine="interleave">
    <optional>
      <attribute name="c"/>
    </optional>
  </define>
  <!-- c: symbol (tag) comment -->
  <define name="pardefs">
    <element name="pardefs">
      <ref name="attlist.pardefs"/>
      <oneOrMore>
        <ref name="pardef"/>
      </oneOrMore>
    </element>
  </define>
  <define name="attlist.pardefs" combine="interleave">
    <empty/>
  </define>
  <!-- paradigm definition section -->
  <define name="pardef">
    <element name="pardef">
      <ref name="attlist.pardef"/>
      <oneOrMore>
        <ref name="e"/>
      </oneOrMore>
    </element>
  </define>
  <!-- paradigm definition -->
  <define name="attlist.pardef" combine="interleave">
    <attribute name="n"/>
  </define>
  <!-- n: paradigm name -->
  <define name="attlist.pardef" combine="interleave">
    <optional>
      <attribute name="c"/>
    </optional>
  </define>
  <!-- c: comment about paradigm -->
  <define name="section">
    <element name="section">
      <ref name="attlist.section"/>
      <oneOrMore>
        <ref name="e"/>
      </oneOrMore>
    </element>
  </define>
  <!-- dictionary section -->
  <define name="attlist.section" combine="interleave">
    <attribute name="id">
      <data type="ID"/>
    </attribute>
    <attribute name="type">
      <choice>
        <value>standard</value>
        <value>inconditional</value>
        <value>postblank</value>
        <value>preblank</value>
      </choice>
    </attribute>
  </define>
  <!-- id: dictionary section identifier -->
  <!-- type: dictionary section type -->
  <define name="e">
    <element name="e">
      <ref name="attlist.e"/>
      <oneOrMore>
        <choice>
          <ref name="i"/>
          <ref name="p"/>
          <ref name="par"/>
          <ref name="re"/>
        </choice>
      </oneOrMore>
    </element>
  </define>
  <!-- entry -->
  <define name="attlist.e" combine="interleave">
    <optional>
      <attribute name="r">
        <choice>
          <value>LR</value>
          <value>RL</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="lm"/>
    </optional>
    <optional>
      <attribute name="a"/>
    </optional>
    <optional>
      <attribute name="c"/>
    </optional>
    <optional>
      <attribute name="i"/>
    </optional>
    <optional>
      <attribute name="slr"/>
    </optional>
    <optional>
      <attribute name="srl"/>
    </optional>
    <optional>
      <attribute name="alt"/>
    </optional>
    <optional>
      <attribute name="v"/>
    </optional>
    <optional>
      <attribute name="vl"/>
    </optional>
    <optional>
      <attribute name="vr"/>
    </optional>
  </define>
  <!--
    r: restriction LR: left-to-right,
    RL: right-to-left
  -->
  <!-- lm: lemma -->
  <!-- a: author -->
  <!-- c: comment -->
  <!-- i: ignore ('yes') means ignore, otherwise it is not ignored) -->
  <!-- slr: translation sense when translating from left to right -->
  <!-- srl: translation sense when translating from right to left -->
  <!-- alt: alternative entries are omitted if not selected -->
  <!-- v: variant sets (monodix) direction restrictions based on language variant -->
  <!-- vl: variant left sets direction restrictions based on language variant for language on left of bidix -->
  <!-- vr: variant right sets direction restrictions based on language variant for language on right of bidix -->
  <define name="par">
    <element name="par">
      <ref name="attlist.par"/>
      <empty/>
    </element>
  </define>
  <!-- reference to paradigm -->
  <define name="attlist.par" combine="interleave">
    <attribute name="n"/>
  </define>
  <!-- n: paradigm name -->
  <define name="i">
    <element name="i">
      <ref name="attlist.i"/>
      <zeroOrMore>
        <choice>
          <text/>
          <ref name="b"/>
          <ref name="s"/>
          <ref name="g"/>
          <ref name="j"/>
          <ref name="a"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="attlist.i" combine="interleave">
    <empty/>
  </define>
  <!-- identity -->
  <define name="re">
    <element name="re">
      <ref name="attlist.re"/>
      <text/>
    </element>
  </define>
  <define name="attlist.re" combine="interleave">
    <empty/>
  </define>
  <!-- regular expression identification -->
  <define name="p">
    <element name="p">
      <ref name="attlist.p"/>
      <ref name="l"/>
      <ref name="r"/>
    </element>
  </define>
  <define name="attlist.p" combine="interleave">
    <empty/>
  </define>
  <!-- pair of strings -->
  <define name="l">
    <element name="l">
      <ref name="attlist.l"/>
      <zeroOrMore>
        <choice>
          <text/>
          <ref name="a"/>
          <ref name="b"/>
          <ref name="g"/>
          <ref name="j"/>
          <ref name="s"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="attlist.l" combine="interleave">
    <empty/>
  </define>
  <!-- left part of p -->
  <define name="r">
    <element name="r">
      <ref name="attlist.r"/>
      <zeroOrMore>
        <choice>
          <text/>
          <ref name="a"/>
          <ref name="b"/>
          <ref name="g"/>
          <ref name="j"/>
          <ref name="s"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <define name="attlist.r" combine="interleave">
    <empty/>
  </define>
  <!-- right part of p -->
  <define name="a">
    <element name="a">
      <ref name="attlist.a"/>
      <empty/>
    </element>
  </define>
  <define name="attlist.a" combine="interleave">
    <empty/>
  </define>
  <!-- post-generator wake-up mark -->
  <define name="b">
    <element name="b">
      <ref name="attlist.b"/>
      <empty/>
    </element>
  </define>
  <define name="attlist.b" combine="interleave">
    <empty/>
  </define>
  <!-- blank chars block mark -->
  <define name="g">
    <element name="g">
      <ref name="attlist.g"/>
      <zeroOrMore>
        <choice>
          <text/>
          <ref name="a"/>
          <ref name="b"/>
          <ref name="j"/>
          <ref name="s"/>
        </choice>
      </zeroOrMore>
    </element>
  </define>
  <!-- mark special groups in lemmas -->
  <define name="attlist.g" combine="interleave">
    <optional>
      <attribute name="i"/>
    </optional>
  </define>
  <!-- i is used to co-index groups in the left with those -->
  <!-- on the right of a pair -->
  <define name="j">
    <element name="j">
      <ref name="attlist.j"/>
      <empty/>
    </element>
  </define>
  <define name="attlist.j" combine="interleave">
    <empty/>
  </define>
  <!-- join lexical forms -->
  <define name="s">
    <element name="s">
      <ref name="attlist.s"/>
      <empty/>
    </element>
  </define>
  <!-- reference to symbol (tag) -->
  <define name="attlist.s" combine="interleave">
    <attribute name="n">
      <data type="IDREF"/>
    </attribute>
  </define>
  <start>
    <choice>
      <ref name="dictionary"/>
    </choice>
  </start>
</grammar>
<!-- n: symbol (tag) name -->