> I have a document like this:
> 
> <xml>
>   <page>
>     <rev>...</rev>
>     <rev>...</rev>
>   </page>
>   ... (some hundreds of pages)
>   <page>
>     <rev>...
> 
> so it's not well formed. 

It's not clear from that description why it isn't well-formed.

> I only want to be able to write out 
> the first pages, but the SAX Parser throws errors:

You should be able to abort the parse when you have read what you want, by
throwing an exception from any of the callback methods (e.g endElement()).
The parser will then exit back to your application with an exception, which
you can catch. You should check that this exception is the one you were
expecting, not some other unrelated error in your input.
> 
> Exception in thread "main" org.xml.sax.SAXParseException: XML 
> document structures must start and end within the same entity.
> 
> I've instanciated an XMLReader and set
> parser.setFeature("http://xml.org/sax/features/validation", 
> false); but it seems, it doesn't really help...

That option controls DTD validation, which will not affect well-formedness
checking.

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


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