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From Sylvain Wallez <>
Subject Re: can reader read external url?
Date Tue, 30 Sep 2003 10:48:09 GMT
Tsui, Alban wrote:

> I want to set up a pipeline so that the reader will read in an url as 
> svg and then it immediately pipes out bmp, for example:
> <!-- the query string parameter for url is simply an url path to a svg 
> image -->
>                         <map:match pattern="*/svg2bmp?url=**">
>                                 <map:read src="{2}" mime-type="svg+xml"/>
>                                 <map:serialize type="svg2jpeg"/>
>                         </map:match>
> I tried but it didn't seem to work.
> Have I done something wrong? Or can the reader read "src" as url? Can 
> someone suggest a solution?

A reader is a kind of complete pipeline on its own, targeted a directly 
providing binary content without involving any XML processing. So 
processing of the sitemap above stops at <map:read> (the svg is sent 
verbatim to the browser) and <map:serialize> is never reached.

> Alternative I need to write a xsp generator read the url xml/svg and 
> then having a transform just copy the content from the root tag 
> generated from the xsp and then put it through the svg2jpeg serialize 
> step.... yuk.

Wow, how complicated ! You just need the (default) file generator. And 
you can't match on a request parameter (the ?url=**), but use it in the 
pipeline :
<map:match pattern="*/svg2bmp">
  <map:generate src="{request-param:url}"/>
  <map:serialize type="svg2jpeg"/>

Now I personally prefer to use non-parameterized URIs when it makes sense:
<map:match pattern="*/svg2bmp/**.jpeg">
  <map:generate src="{2}.svg"/>
  <map:serialize type="svg2jpeg"/>

Hope this helps !


Sylvain Wallez                                  Anyware Technologies 
{ XML, Java, Cocoon, OpenSource }*{ Training, Consulting, Projects }
Orixo, the opensource XML business alliance  -

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