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To add a watermark to the PDF output of a DITA map transformation, create a DITA-OT customization directory and use it from a DITA Map to PDF transformation scenario, as in the following procedure:

  1. Copy the entire directory: DITA-OT-DIR\plugins\org.dita.pdf2\Customization to another location (for instance, C:\Customization).
  2. Copy your watermark image (for example, watermark.png) to: C:\Customization\common\artwork\watermark.png.
  3. Rename the C:\Customization\catalog.xml.orig file to: C:\Customization\catalog.xml.
  4. Open the catalog.xml in Oxygen XML Editor and uncomment this line:
    <!--uri name="cfg:fo/xsl/custom.xsl" uri="fo/xsl/custom.xsl"/--> 

    The uncommented line should look like this:

    <uri name="cfg:fo/xsl/custom.xsl" uri="fo/xsl/custom.xsl"/>
  5. Rename the file: C:\Customization\fo\xsl\custom.xsl.orig to: C:\Customization\fo\xsl\custom.xsl
  6. Open the C:\Customization\fo\xsl\custom.xsl file in Oxygen XML Editor to overwrite two XSLT templates:
    • The first template is located in the XSLT stylesheet DITA-OT-DIR\plugins\org.dita.pdf2\xsl\fo\static-content.xsl and we override it specifying a watermark image for every page in the PDF content, using a block-container element that references the watermark image file:
      <fo:static-content flow-name="odd-body-header">
             <fo:block-container absolute-position="absolute"
                top="-2cm" left="-3cm" width="21cm" height="29.7cm"
                background-image="{concat($artworkPrefix, 
      '/Customization/OpenTopic/common/artwork/watermark.png')}">
               <fo:block/>
             </fo:block-container>
            <fo:block xsl:use-attribute-sets="__body__odd__header">
                <xsl:call-template name="insertVariable">
                    <xsl:with-param name="theVariableID" select="'Body odd header'"/>
                    <xsl:with-param name="theParameters">
                       <prodname>
                           <xsl:value-of select="$productName"/>
                       </prodname>
                       <heading>
                     <fo:inline xsl:use-attribute-sets="__body__odd__header__heading">
                            <fo:retrieve-marker retrieve-class-name="current-header"/>
                     </fo:inline>
                      </heading>
                     <pagenum>
                   <fo:inline xsl:use-attribute-sets="__body__odd__header__pagenum">
                          <fo:page-number/>
                   </fo:inline>
                 </pagenum>
              </xsl:with-param>
            </xsl:call-template>
          </fo:block>
        </fo:static-content>
              
      </xsl:template>
    • The second template that we override is located in the XSLT stylesheet DITA-OT-DIR\plugins\org.dita.pdf2\xsl\fo\commons.xsl and is used for styling the first page of the output. We also override it by copying the original template content in our custom.xsl and adding the block-container element that references the watermark image file:
      <xsl:template name="createFrontMatter_1.0">
            <fo:page-sequence master-reference="front-matter" 
      xsl:use-attribute-sets="__force__page__count">
                <xsl:call-template name="insertFrontMatterStaticContents"/>
                <fo:flow flow-name="xsl-region-body">
                    <fo:block-container absolute-position="absolute"
                        top="-2cm" left="-3cm" width="21cm" height="29.7cm"
                        background-image="{concat($artworkPrefix, 
      '/Customization/OpenTopic/common/artwork/watermark.png')}">
                        <fo:block/>
                    </fo:block-container>
        <fo:block xsl:use-attribute-sets="__frontmatter">
             <!-- set the title -->
          <fo:block xsl:use-attribute-sets="__frontmatter__title">
           <xsl:choose>
            <xsl:when test="$map/*[contains(@class,' topic/title ')][1]">
          <xsl:apply-templates select="$map/*[contains(@class,' topic/title ')][1]"/>
            </xsl:when>
            <xsl:when test="$map//*[contains(@class,' bookmap/mainbooktitle ')][1]">
          <xsl:apply-templates select="$map//*[contains
      (@class,' bookmap/mainbooktitle ')][1]"/>
                </xsl:when>
                <xsl:when test="//*[contains(@class, ' map/map ')]/@title">
                    <xsl:value-of select="//*[contains(@class, ' map/map ')]/@title"/>
                </xsl:when>
                  <xsl:otherwise>
                   <xsl:value-of select="/descendant::*[contains
      (@class, ' topic/topic ')][1]/*[contains(@class, ' topic/title ')]"/>
                  </xsl:otherwise>
            </xsl:choose>
          </fo:block>
                          
         <!-- set the subtitle -->
         <xsl:apply-templates select="$map//*[contains
      (@class,' bookmap/booktitlealt ')]"/>
                          
            <fo:block xsl:use-attribute-sets="__frontmatter__owner">
               <xsl:apply-templates select="$map//*[contains
      (@class,' bookmap/bookmeta ')]"/>
            </fo:block>
                          
            </fo:block>
                      
         <!--<xsl:call-template name="createPreface"/>-->
                      
            </fo:flow>
              </fo:page-sequence>
              <xsl:if test="not($retain-bookmap-order)">
                  <xsl:call-template name="createNotices"/>
              </xsl:if>
          </xsl:template>
  7. Edit your DITA Map PDF transformation scenario. In the Parameters tab, set the customization.dir parameter to C:\Customization.