Re: [docbook-apps] Renaming processing instructions

Thanks Bob - works perfectly.

    I had to declare my custom PI names as strings when calling the
    dbfo-attribute template, so there are extra quote marks around each
    name in the following line:

    <xsl:with-param name="attribute" select="'bgposition'"/>

    

    Dave

    

    On 31-10-12 3:10 AM, Bob Stayton wrote:
    Yes, you can use names in the PIs that differ from the
      output attribute names.  In fact, there is no automatic
      passthrough. The information inside a dbfo PI is actually
      pseudo-attributes.  They look like attributes, but they are just
      text strings organized in a way that can assign a value to a name.
      The PI processing templates parse them as strings to extract a
      value assigned to a given pseudo-attribute name.  Then some
      template has to generate an actual <xsl:attribute> to assign
      the value to an output attribute name, which is independent of the
      pseudo-attribute name.  So your example could be:
      

      

      A PI in the source file:
      

      

      <?dbfo bgimage="myfile.jpg"?>
      

      

      Extracting the value:
      

      

      <xsl:variable name="bgroundimage">
      

       <xsl:call-template name="dbfo-attribute">
      

         <xsl:with-param name="pis"
      

            
select="ancestor-or-self::d:abstract/processing-instruction('dbfo')"/>

         <xsl:with-param name="attribute" select="bgimage"/>
      

       </xsl:call-template>
      

      </xsl:variable>
      

      

      <xsl:variable name="backgroundimg">
      

       <xsl:value-of select="concat('url(', $bgroundimage, ')')"/>
      

      </xsl:variable>
      

      

      and further down, using the value for an output attribute:
      

      

      <xsl:attribute name="background-image">
      

       <xsl:value-of select="$backgroundimg"/>
      

      </xsl:attribute>
      

      

      

      Bob Stayton
      

      Sagehill Enterprises
      

      
      

      

      

      

      From: Xmplar
      

      Sent: Tuesday, October 30, 2012 3:11 AM
      

      To: 
      

      Subject: [docbook-apps] Renaming processing instructions
      

      

      

      I have managed to (mostly) achieve the PIs I need, but I'd like to
      know if it's possible to rename PIs to shorten the amount of text.
      

      In the XML I have:
      

      <abstract>
      

                 <?dbfo background-image="images/Box5-4.gif"
      background-position="0% 30%"
      ex:background-content-width="60mm"?>
      

                 <title>Chapter 1 overview</title>
      

      ...
      

      

      My customization so far needs to use those long names 
      ("background-image", etc.). Can I somehow rename these to, say,
      "bgimage" instead of "background-image"?
      

      

      My customization is:
      

      <xsl:template match="d:abstract"
      mode="chapter.titlepage.recto.auto.mode">
      

      

         <xsl:variable name="bgroundimage">
      

           <xsl:call-template name="dbfo-attribute">
      

             <xsl:with-param name="pis"
      

              
select="ancestor-or-self::d:abstract/processing-instruction('dbfo')"/>

             <xsl:with-param name="attribute"
      select="'background-image'"/>
      

           </xsl:call-template>
      

         </xsl:variable>
      

         <xsl:variable name="backgroundimg">
      

           <xsl:value-of select="concat('url(', $bgroundimage,
      ')')"/>
      

         </xsl:variable>
      

      

         <xsl:variable name="bgroundwidth">
      

           <xsl:call-template name="dbfo-attribute">
      

             <xsl:with-param name="pis"
      

              
select="ancestor-or-self::d:abstract/processing-instruction('dbfo')"/>

             <xsl:with-param name="attribute"
      select="'ex:background-content-width'"/>
      

           </xsl:call-template>
      

         </xsl:variable>
      

      

         <xsl:variable name="bgroundposition">
      

           <xsl:call-template name="dbfo-attribute">
      

             <xsl:with-param name="pis"
      

              
select="ancestor-or-self::d:abstract/processing-instruction('dbfo')"/>

             <xsl:with-param name="attribute"
      select="'background-position'"/>
      

           </xsl:call-template>
      

         </xsl:variable>
      

      

         <fo:block xmlns:fo="http://www.w3.org/1999/XSL/Format"
      

           xmlns:ex="http://www.renderx.com/XSL/Extensions"
      

           xsl:use-attribute-sets="chapsummaryprops">
      

           <xsl:if test="processing-instruction()">
      

             <xsl:attribute name="background-image">
      

               <xsl:value-of select="$backgroundimg"/>
      

             </xsl:attribute>
      

             <xsl:attribute name="ex:background-content-width">
      

               <xsl:value-of select="$bgroundwidth"/>
      

             </xsl:attribute>
      

             <xsl:attribute name="background-position">
      

               <xsl:value-of select="$bgroundposition"/>
      

             </xsl:attribute>
      

           </xsl:if>
      

      

           <xsl:apply-templates select="d:title" />
      

           <xsl:apply-templates select="d:para" />
      

         </fo:block>
      

       </xsl:template>
      

      

      Thanks,
      

      

      On 29-10-12 10:35 PM, Xmplar wrote:
      

      I'm trying to create a custom processing instruction to insert and
      format a background image in a chapter abstract. I've followed the
      instructions in Chapter 9 of DocBook XSL TDG but am getting error
      messages about empty parameters.
      

      The XML is:
      

      <abstract>
      

                 <?dbfo bgimage="images/Box5-4.gif"?>
      

                 <?dbfo bgposition="50% 30%"?>
      

                 <?dbfo bgwidth="170mm"?>
      

                 <title>Chapter 1 overview</title>
      

                 <para>The text in . </para>
      

             </abstract>
      

         </info>
      

      (I'd like to combine all three params into one pi if possible.)
      

      

      I've set up variables for background-image, content-width and
      position:
      

      <xsl:template match="d:abstract"
      mode="chapter.titlepage.recto.auto.mode">
      

         <xsl:variable name="bgimage">
      

           <xsl:call-template name="dbfo-attribute">
      

             <xsl:with-param name="pis"
      

              
select="ancestor-or-self::d:abstract/processing-instruction('dbfo')"/>

             <xsl:with-param name="attribute"
      select="'background-image'"/>
      

           </xsl:call-template>
      

         </xsl:variable>
      

         <xsl:variable name="bgwidth">
      

           <xsl:call-template name="dbfo-attribute">
      

             <xsl:with-param name="pis"
      

              
select="ancestor-or-self::d:abstract/processing-instruction('dbfo')"/>

             <xsl:with-param name="attribute"
      select="'ex:background-content-width'"/>
      

           </xsl:call-template>
      

         </xsl:variable>
      

         <xsl:variable name="bgposition">
      

           <xsl:call-template name="dbfo-attribute">
      

             <xsl:with-param name="pis"
      

              
select="ancestor-or-self::d:abstract/processing-instruction('dbfo')"/>

             <xsl:with-param name="attribute"
      select="'background-position'"/>
      

           </xsl:call-template>
      

         </xsl:variable>
      

      

         <fo:block xmlns:fo="http://www.w3.org/1999/XSL/Format"
      

           xmlns:ex="http://www.renderx.com/XSL/Extensions"
      

           xsl:use-attribute-sets="chapsummaryprops"
      

           background-image="{$bgimage}"
      

           ex:background-content-width="{$bgwidth}"
      

           background-position="{$bgposition}">
      

           <xsl:apply-templates select="d:title" />
      

           <xsl:apply-templates select="d:para" />
      

           <!--<xsl:apply-templates select="."
      mode="chapter.titlepage.recto.mode"/>-->
      

         </fo:block>
      

       </xsl:template>
      

      

      And when I process it with Saxon 6.5.5 the error messages are:
      

      [warning] Attribute 'background-image' cannot have a value of "":
      should be either 'inherit' or a URI: background-image="url(...)".
      

         [error] Attribute 'rx:background-content-width' cannot have a
      value of "".
      

      I'm using DB 1.77.1, XEP 4.19.
      

      Thanks