se/SE/schema/WPS_Functions/dita-ot/dita-ot-3.5/docsrc/topics/pdf2-creating-change-bars.dita

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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<!--  This file is part of the DITA Open Toolkit project. See the accompanying LICENSE file for applicable license.  -->

<concept id="concept_gsc_vcf_vs">
  <title>Generating revision bars</title>
  <shortdesc>If you use Antenna House Formatter or RenderX XEP, you can generate revision bars in your PDF output by
    using the <xmlatt>changebar</xmlatt> and <xmlatt>color</xmlatt> attributes of the DITAVAL
      <xmlelement>revprop</xmlelement> element.</shortdesc>
  <prolog>
    <metadata>
      <keywords>
        <indexterm><xmlelement>revprop</xmlelement></indexterm>
        <indexterm><xmlatt>changebar</xmlatt></indexterm>
        <indexterm><xmlatt>color</xmlatt></indexterm>
        <indexterm>DITAVAL
          <indexterm>change bars</indexterm></indexterm>
        <indexterm>RenderX
          <indexterm>change bars</indexterm></indexterm>
        <indexterm>Antenna House
          <indexterm>change bars</indexterm></indexterm>
        <indexterm>Apache FOP
          <indexterm>change bars</indexterm></indexterm>
        <indexterm>PDF
          <indexterm>change bars</indexterm></indexterm>
        <indexterm>transformations</indexterm>
      </keywords>
    </metadata>
  </prolog>
  <conbody>
    <p>The DITA specification for <xmlatt>changebar</xmlatt> simply says:<lq>
        <dl>
          <dlentry>
            <dt><xmlatt>changebar</xmlatt></dt>
            <dd>When flag has been set, specify a changebar color, style, or character, according to the changebar
              support of the target output format. If flag has not been set, this attribute is ignored.</dd>
          </dlentry>
        </dl>
      </lq></p>
    <p>The current version of DITA Open Toolkit uses two <xmlelement>revprop</xmlelement> attribute values to define
      revision bars:</p>
    <ul>
      <li>
        <p>The <xmlatt>changebar</xmlatt> attribute value defines the style to use for the line. The list of possible
          values is the same as for other XSL-FO rules (see
          <xref keyref="fo-spec.change-bar-style"/>). The default value is <option>groove</option>.</p></li>
      <li>
        <p>The <xmlatt>color</xmlatt> attribute value specifies the change bar color using any color value recognized by
          XSL-FO, including the usual color names or a hex color value. The default value is
        <option>black</option>.</p></li>
    </ul>
    <fig>
      <title>Sample revision bar configuration</title>
      <codeblock outputclass="language-xml">&lt;revprop action="flag" changebar="solid" color="green"/></codeblock>
    </fig>
    <p>DITA-OT uses a default offset of 2 mm to place the revision bar near the edge of the text column. The offset,
      placement and width are not currently configurable via attribute values.</p>
    <!-- Doesn't look like there is any way to set the offset (defaults to `2mm2), placement, or width -->
    <!-- https://github.com/dita-ot/dita-ot/pull/3111#issuecomment-431110715 -->
    <!-- 
    <parml>
      <plentry>
        <pt>offset</pt>
        <pd>The space to offset the revision bar from the edge of the text column. You can use points (pt) or
          millimeters (mm).</pd>
      </plentry>
      <plentry>
        <pt>placement</pt>
        <pd>The side of the text column on which to place the revision bar. The allowed values are
            <option>start</option> (left side for left-to-right languages) and <option>end</option> (right side for
          left-to-right languages). The default value is <option>start</option>.</pd>
      </plentry>
      <plentry>
        <pt>width</pt>
        <pd>The width of the rule as a measurement value. Typical values are <option>1pt</option> and
            <option>0.5pt</option>, which renders a hairline rule.</pd>
      </plentry>
    </parml>
    -->
    <p>XSL-FO 1.1 does not provide for revision bars that are not rules, so there is no way to get text revision
      indicators instead of rules, for example, using a number in place of a rule. Antenna House Formatter provides a
      proprietary extension to enable this, but the DITA-OT PDF transformation does not take advantage of it.</p>
  </conbody>
</concept>