Flagging Content
In DITA, you can mark certain content to flag it or draw attention to it. This is done by defining a flag in a DITAVAL file.
You can attach the DITAVAL file to the DITA map using the <ditavalref>
      element in the map, or by specifying it in the args.filter transformation
      parameter.
In the following example, all the elements that have the attribute @product
      set to YourProd is flagged to have a purple background:
<val>
...
   <prop action="flag" att="product" val="YourProd" backcolor="purple"/>
...
</val>
    How to Flag Content Using Change Bars
As an example, to add a change bar (revision mark) for particular content, you
      can use the following in the DITAVAL
      file:
    <val>
  <revprop action="flag" 
    changebar="color:blue;style:solid;width:2pt;offset:1.25mm;placement:start" val="new"/>
</val>This would result in any content that is marked with @rev="new" having a blue
      change bar.
How to Flag Content Using Images
You can mark the elements that match a specific profiling condition using images (one for the start, one for the end). The image references are relative to the DITAVAL file.
<val>
   <prop action="flag" 
          att="product"  val="MyProd" 
          backcolor="blue"
          color="yellow" >
      <startflag imageref="startflag.jpg">
        <alt-text>This is the start of my product info</alt-text>
      </startflag>
      <endflag imageref="endflag.jpg">
        <alt-text>This is the end of my product info</alt-text>
      </endflag>
   </prop>
</val>