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Re: [Sax-devel] Re: SAX survey: expected local name for non-namespace q

• To: "Yuval Oren" <yuval@b...>,"David Brownell" <david-b@p...>,"Karl Waclawek" <karl@w...>
• Subject: Re: [Sax-devel] Re: SAX survey: expected local name for non-namespace qualified elements
• From: "Rob Lugt" <roblugt@e...>
• Date: Sun, 2 Jun 2002 22:18:30 +0100
• Cc: <xerces-j-dev@x...>,<sax-devel@l...>,<xml-dev@l...>
• References: <NDBBKAIFOLAGCAFIGOJJGELBCMAA.yuval@b...>

Yuval Oren wrote
> > >
> > > With namespace processing off, SAX2 compliant parsers can provide a
> > > localName value of either "" or "doc"
> >
> > This is nonsense.  If namespace processing is off, what specification
are
> > you invoking to come up with a localName of "doc"?
> >
> > ~Rob
>
> By "namespace processing off" I meant that the
> "http://xml.org/sax/features/namespaces" feature was set to false. I was
> thus referring to the Javadoc for ContentHandler.startElement():
>
> *  the Namespace URI and local name are required when the namespaces
> property is true (the default), and are optional when the namespaces
> property is false (if one is specified, both must be);
>
> I read this to mean that if a SAX2 parser so chooses, it can process the
> element for namespaces even though the feature is off. And that's how we
get
> a localName of "doc".

I see.  I have always understood the http://xml.org/sax/features/namespaces
feature to mean "behave as a vanilla XML 1.0 processor without reference to
the Namespaces in XML recommendation".

I think there are good reasons for treating the option in this way, rather
than just using it as a flag to control the parameters to startElement().
For one thing, the Namespaces recommendation introduces "namespace
constraints", (e.g. no ':' in entity name), which I would expect to be
flagged [1] by an XML processor in namespace mode but ignored when in plain
XML 1.0 mode.

~Rob

[1] xmlvalid treats namespace constraint violations as fatal errors when
namespaces are enabled

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