Creating Change Bars
The PDF2 transform can generate change (revision) bars with XSL-FO engines that support the fo:change-bar formatting object.
As of July 2015 the Antenna House Formatter and RenderX XEP FO engines support change bar generation but FOP 1.1 does not.
- 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.
<revprop action="flag" val="rev01" changebar="color:black;style:solid;width:0.5pt" />
- The style to use for the line, as for other XSL-FO rules (@change-bar-style). The value "solid" produces a solid rule. The default is "none".
- Any color value recognized by XSL-FO, including the usual color names or a hex color value. The default is "black".
- The space as a measurement value (e.g., points (pt) or millimeters (mm)) to offset the bar from the edge of the text column.
- The side of the text column on which to place the change bar, one of "start" (left side for left-to-right languages) or "end" (right side for left-to-right languages). The default is "start".
- The width of the rule as a measurement value. Typical values are "1pt" and "0.5pt" (hairline rule).
To get a rule at all you must specify a value for style, e.g. "style:solid" and should specify a value for width so you get an appropriately-sized rule, e.g., "width:0.5pt".
Note that XSL-FO 1.1 does not provide for revision "bars" that are not rules, so there is no standard way to get text revision indicators instead of rules, e.g. using a number in place of a rule. Antenna House Formatter does provide a proprietary extension to allow this but the PDF2 transform does not take advantage of it.