Re: [docbook-apps] general approach to image maps

[Georges Schmitz <georges.schmitz@arcor.de>]

OK, I got it working. In my source, I have now the following imagemap
statement:

    <imageobject role="html">
        <imagedata format="PNG" fileref="../dot/tc-compact.png"/>
        <?dbhtml-imagemap href="../dot/tc-compact.map"?>
    </imageobject>

In fact, I just made 3 rather small extensions to existing templates:

   1. Reusing code in pi.xsl: I extended the match attribute in template
      for dbhtml-include:
        <xsl:template match="processing-instruction('dbhtml-include') |
      processing-instruction('dbhtml-imagemap')">
      no other change made here.
   2. In <xsl:template match="imagedata">
         1. a variable "image.map" is filled:
            <xsl:variable name="image.map">
              <xsl:apply-templates 
            select="../processing-instruction('dbhtml-imagemap')"/>
            </xsl:variable>
         2. in <xsl:call-template name="process.image"> I pass a new
            parameter
              <xsl:with-param name="image.map.id"
            select="exsl:node-set($image.map)/map/@id"/>
         3. and after this call-template the content of the variable is
            copied
              <xsl:if test="$image.map">
                <xsl:copy-of select="$image.map"/>
              </xsl:if>
   3. in the named template "process.image" I generate a new attribute,
      depending on its existence
      <!-- externally provided imagemap id -->
      <xsl:if test="$image.map.id">
        <xsl:attribute name="usemap">
          <xsl:value-of select="$image.map.id"/>
        </xsl:attribute>
      </xsl:if>

With xsltproc it works fine; Xalan and Saxon are causing problems with
URI resolver (as always under Windows), the well known bug that
apparently will never be fixed:

    Resolved URI: ../dot/tc-compact.map
      file://D:/workspace/empic/resources/businessmodel/dot/tc-compact.map

As I already stated in my former mail, the affected templates are rather
big ones, and I don't want to have them in my customization layer. Is
there a chance to get this extension into the official stylesheet package?

Regards,
Georges

Georges Schmitz wrote:
> I'm searching for a general approach for using image maps with DocBook
> and I'm not referring to the image maps of callout objects.
>
>