Thank you very much Victor (Mote) for your prompt answer. You solution was
exactly what I needed. I did not realize it was an XSLT question until I saw
your answer. Thanks for getting me un-stuck!
Victor Mote wrote:
> William L. Gibson wrote:
>
> > I wish to use fop-0.20.5rc3 to process an XML doc using an XSL
> > stylesheet that contains both XSLT and FO directives. I extract an
> > itemNumber from the XML, save it in an XSL variable, use it to
> > dynamically build a url to an external servlet that will return a jpeg
> > barcode for that item number. I store the calculated url in an XSL
> > variable. Finally I wish to use the FO external-graphic to place the
> > servlet generated image into the output pdf document, but I can't figure
> > out any way to put the calculated url into the src attribute. It seems
> > to only accept a string literal.
> >
> > Is there any way to do what I want (use a calculated url to insert an
> > image generated by an external servlet)?
> >
> > <xsl:variable name="itemNumber"
> > select="ReportData/Record/structItemRecord/core/structItem/strItem
> > Number"/>
> >
> > <xsl:variable name="calcUrl"
> > select="concat('http://www.javabarcoding.com/servlet/lin?BARCODE=',
> > $itemNumber,
> > '&BAR_HEIGHT=1&CODE_TYPE=CODE39&X=0.03&CHECK_CHAR=
> N&CHECK_CHARINTEXT=N&CODE128_SET=0>
> &HEIGHT=100&WIDTH=400')"/>
> >
> > <fo:block text-align="left"><fo:external-graphic
> > src="url(????????)"/></fo:block>
>
> I'm not sure I'm following your question. Are you trying to do this?:
>
> <fo:block text-align="left>
> <fo:external-graphic>
> <xsl:attribute name="src">
> <xsl:value-of select="$calcUrl"/>
> </xsl:attribute>
> </fo:external-graphic>
> ....
>
> I'm not really fluent in XSLT, but the above seems to be the concept you are
> looking for. The syntax may need some work.
>
> BTW, pure XSLT questions like this kind of risk getting ignored on this
> list. See:
> http://xml.apache.org/fop/maillist.html#fop-user-policy
> for more information, and see:
> http://xml.apache.org/fop/maillist.html#xslt-mulberry
> for an XSLT-specific mailing list. And see:
> http://xml.apache.org/fop/resources.html#documents-xslt
> for a list of XSLT books and other resources that you may find helpful.
>
> > By the way, the url function that is shown in some fop examples used
> > inside the src attribute as above must be a fop specific function or so
> > it seems to me. Where can I find documentation on such fop functions?
>
> See:
> http://xml.apache.org/fop/fo.html#external-resources
> where the syntax is described, with links to the appropriate underlying
> standards. It is possible that some of the example files are not up-to-date.
> If you can be more specific, we'll work on getting them fixed.
>
> Victor Mote
>
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