RE: Base URIs of redirected documents

Thanks for this information. However, please note that Saxon 7.8 does
not have any built-in XML parser, or even a default choice of parser. It
uses whichever parser your Java environment is configured to provide.
For most people, that will be Crimson, but that's your choice, not
Saxon's.

I find the phrase "the URI of the resource" in the erratum that you
quote a little strange. Since when is resource required to have only one
URI? 

Michael Kay

> -----Original Message-----
> From: saxon-help-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@xxxxxxxxxxxxxxxx 
> [mailto:saxon-help-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@xxxxxxxxxxxxxxxx] 
> On Behalf Of 
> Elliotte Harold
> Sent: 23 November 2003 22:09
> To: saxon-help-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@xxxxxxxxxxxxxxxx
> Subject: [saxon] Base URIs of redirected documents
> 
> 
> There appears to be a bug in Saxon 7.8's bundled XML parser 
> with respect 
> to the base URI of documents loaded from a redirected URL. 
> For example, 
> consider http://www.ibiblio.org/xml/redirecttest.xml. This document 
> redirects to http://www.ibiblio.org/xml/redirected/target.xml. If the 
> document references an external DTD in its document type declaration, 
> Saxon attempts to load it from the original URI rather than the 
> document's actual base URI.
> 
> You can verify this by applying any stylesheet to 
> http://www.ibiblio.org/xml/redirecttest.xml. For example,
> 
> [elharo-pcVu8ycTT4Q@xxxxxxxxxxxxxxxx elharo]$ java -classpaxon.Transform 
> http://www.ibiblio.org/xml/redirecttest.xml test.xsl
> Error on line 1 of http://www.ibiblio.org/xml/redirecttest.xml:
>   Error reported by XML parser: External entity not found: 
> "http://www.ibiblio.org/xml/redirected.dtd";.
> Transformation failed: Run-time errors were reported
> 
> The problem goes away if you use Xerces 2.6 as the parser. 
> This version 
> of Xerces correctly sets the base URI (earlier versions did not):
> 
> [elharo-pcVu8ycTT4Q@xxxxxxxxxxxxxxxx elharo]$ java -classpath 
> /opt/xml/saxon-7.8/saxon7.jar:./XOM/lib/xercesImpl.jar 
> net.sf.saxon.Transform -x org.apache.xerces.parsers.SAXParser 
> http://www.ibiblio.org/xml/redirecttest.xml test.xsl
> <?xml version="1.0" encoding="UTF-8"?>root
> 
> This is behavior is in keeping with erratum E43 to the second 
> edition of 
> XML, which states:
> 
> Attempts to retrieve the resource identified by a URI may be 
> redirected 
> at the parser level (for example, in an entity resolver) or below (at 
> the protocol level, for example, via an HTTP |Location:| 
> header). In the 
> absence of additional information outside the scope of this 
> specification within the resource, the base URI of a resource 
> is always 
> the URI of the actual resource returned. In other words, it 
> is the URI 
> of the resource retrieved after all redirection has occurred.
> 
> This also affects pure host URLs with no path such as 
> http://www.cafeconleche.org. They are redirected to 
> http://www.cafeconleche.org/. However, Saxon attempts to load the DTD 
> from http://www.cafeconleche.orgDTD/ rather than 
> http://www.cafeconleche.org/DTD/.
> 
> --
> Elliotte Rusty Harold
> 
> 
> 
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