Re: Validation with Xerces

[ro...@elastica.com]

Do you need to use apache specific feature uris?

see http://xml.apache.org/xerces2-j/features.html

Quoting Rich Knox <ri...@dreamflying.com>:

> 
> 
> 
>   
>   
> 
> 
> I have code that runs successfully against the Crimson XML parser
> provided with JDK 1.4. I'm having problems getting it to run correctly
> against the Xerces parser provided in JDK 1.5. We have a DTD we wish to
> validate against. When I run this code against Crimson, everything
> works as expected. When I try to run it against Xerces, the parser does
> not appear to be doing any validation against our DTD. If I make the
> XML badly formed, I get an error in Crimson but not Xerces. Is there
> something special I need to do to enable validation with Xerces that
> was not required with Crimson? Here is a simplified version (error
> handling removed) of the code we use to create and configure the parser:
> 
> 
> 
>         SAXParserFactory factory;
> 
>         SAXParser parser;
> 
>         XMLReader reader;
> 
>  
> 
>         factory = SAXParserFactory.newInstance();
> 
>         factory.setValidating(true);
> 
>  
> 
>         parser = factory.newSAXParser();
> 
>         reader = parser.getXMLReader();
> 
> 
> 
>         // handler is an instance of a class that extends DefaultHandler
> 
>         reader.setContentHandler(handler);
> 
>         reader.setDTDHandler(handler);
> 
>         reader.setErrorHandler(handler);
> 
>         reader.setEntityResolver(handler);
> 
> 
> 
>         //  Set these features explicitly as opposed to relying on their
> 
>         //  default values to deal with differences between various
> 
>         //  crimson and xerces releases. setReaderFeature is a wrapper
> 
>         //  wrapper that catches exceptions and return a boolean
> indicating
> 
>         //  success or failure
> 
>         setReaderFeature(reader,
> "http://xml.org/sax/features/validation", true);
> 
>         setReaderFeature(reader,
> "http://xml.org/sax/features/namespaces", true);
> 
>         setReaderFeature(reader,
> "http://xml.org/sax/features/namespace-prefixes", false);
> 
> 
> 
>         //  Register for lexical events so that we are notified of
> 
>         //  comments.
> 
>         if (!setReaderProperty(reader,
> "http://xml.org/sax/properties/lexical-handler", this))
> 
>         {
> 
>             //  If the previous property "set" failed, try the same
> operation
> 
>             //  with a different version of the property name.
> 
>             setReaderProperty(reader,
> "http://xml.org/sax/handlers/LexicalHandler", this);
> 
>         }
> 
> 
> 
> I also tried using XMLReaderFactory instead of SAXParserFactory and got
> the same results (no validation in Xerces). What do I need to do to get
> Xerces to validate? Thanks.
> 
> 
> 
> -rich
> 
> 
> 
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> 




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