Re: [xsl] fo basic link question

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2009-11-10 19:12 -0800, Mark Wilson wrote:
> Every example for building a uri("...") I can find always fills the 
> parentheses with a quoted string, like uri("s.pdf"). I want to use 
> the value of an attribute:
>
> <fo:basic-link external-destination="url(Heading/@file)" color="blue">
>
> Can I do that? If so, how?

Using an attribute value template:

  <fo:basic-link external-destination='url("{Heading/@file}")' color="blue">

I tell my students it is safest to use double quotes inside the url() syntax:

   url(".....uri.....")

... because URI syntax in RFC2141 section 2.2 production <other> 
allows each of "(", ")" and "'" in a URI, but it doesn't allow a 
double quote.  So imagine that you have used either of the other 
combinations the specification allows:

   url('......uri.....')
   url(.......uri......)

... and your users end up creating a URI that contains "'" or ")" 
(respectively).  You don't know the syntax they are using, you are 
just plugging it into the result using XSLT.  The resulting XSL-FO 
has a malformed specification because the URI string is prematurely terminated.

And don't forget about your attribute delimiters.  If you want to use 
double quotes as your attribute delimiter, you'll need to escape the 
double quote inside.  In my example above I've used single quotes for 
the attribute delimiters which allows me to use naked double quotes inside.

This happened to be part of today's lecture as I am teaching XSL-FO 
this week in Washington DC.

I hope this helps.

. . . . . . . . . . Ken



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