Adding a Watermark to PDF Output

<!--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"/>

• 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>