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RE: SAX Locator vs {start,end}Entity

• To: "'Richard Tobin'" <richard@c...>,<xml-dev@l...>
• Subject: RE: SAX Locator vs {start,end}Entity
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Thu, 20 Feb 2003 13:46:56 -0000
• Importance: Normal
• In-reply-to: <200302201249.MAA24112@m...>
• Reply-to: <michael.h.kay@n...>

Why do you need to monitor the startEntity and endEntity events to get
the base URI? Saxon simply asks the Locator for the systemId when
startElement is reported (or processingInstruction, or an unparsed
entity declaration), and this seems to give the right answer.

Michael Kay


> -----Original Message-----
> From: Richard Tobin [mailto:richard@c...] 
> Sent: 20 February 2003 12:49
> To: xml-dev@l...
> Subject: Re:  SAX Locator vs {start,end}Entity
> 
> 
> >The SAX 2.0 API documentation is silent on this, but the method 
> >descriptions in org.xml.sax.Locator have always led me to 
> believe that 
> >the location should be the entity in which the reference was 
> >encountered,
> 
> Xerces seems to disagree: it returns the entity whose start 
> or end is being reported.  So I guess one can't rely on it.
> 
> But it's worse: the reason I'm doing this is to determine the 
> current base URI, taking account of entity boundaries and 
> xml:base.  This seems to be impossible, since the locator 
> returns the system ID of the entity, not its URI.  So if 
> there is http redirection (e.g. a directory referred to 
> without its trailing slash) the locator provides the 
> unredirected value.  As far as I can see, it's impossible to 
> calculate the base URI using SAX.
> 
> Are there any plans to directly support base URIs in a future 
> version of SAX?
> 
> -- Richard
> 
> 
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