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RE: how to use xml:base and relative URLs with SAX/Java?

• To: "'Anil Philip'" <goodnewsforyou@y...>,"'Elliotte Harold'" <elharo@m...>
• Subject: RE: how to use xml:base and relative URLs with SAX/Java?
• From: "Michael Kay" <mike@s...>
• Date: Mon, 12 Dec 2005 21:55:23 -0000
• Cc: <xml-dev@l...>
• In-reply-to: <20051212210802.58588.qmail@w...>
• Thread-index: AcX/YCFEpR6vRBNPT0y3BtJkQMTrGgAAtGbw

> My basic question is: how do I use xml:base from Java?
> Do I have to define everything from scratch in the
> schema (in that case, what's the point of having
> xml:base as a feature), or is there support in the
> language for the construct?

In XML Schema, I think the point has already been covered: if your schema
doesn't allow the xml:base attribute on a particular element, then an
element that uses xml:base is invalid.

For SAX, there is no special support for xml:base. It's notified to your
application like any other attribute. You application can therefore work out
what the current base URI is, and use it to resolve any relative URI. This
seems reasonable: SAX is explicitly designed as a low-level interface.

If you want a higher-level interface, XPath 2.0 will tell you the base URI
of a node, which means the system will do the legwork for you. In fact, so
will XOM. But SAX won't.

Michael Kay
http://www.saxonica.com/

• References:
  • RE: how to use xml:base and relative URLs with SAX/Java?
    • From: Anil Philip <goodnewsforyou@y...>

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