[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: External subset processing by browsers
Hi Elliotte, 2008/12/5 Elliotte Rusty Harold <elharo@m...>: > Firefox. There are two separate issues here: > > 1. Whether Firefox should read the external DTD subset. > 2. How it should treat unrecognized entities when it doesn't read the > external subset. > > Let me check the spec, but my recollection is that if the external DTD > subset is not read, unrecognized entities are not a fatal error. I have a similar issue, for example there are some RSS feeds which contain entity references but no doctype: <foo>foo € bar</foo> I was trying the handle them by supplying a LexicalHandler (to trap and convert them to numeric refs), and setting a few Xerces features, but it always throws an exception for it before the startEntity event. Sample code (using Xerces 2.9.0): public class Test extends XMLFilterImpl implements LexicalHandler { public static void main(String... args) throws Exception { new Test(); } public Test() throws Exception { String xml = "<foo>foo € bar</foo>"; XMLReader xmlReader = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser"); xmlReader.setProperty("http://xml.org/sax/properties/lexical-handler", this); xmlReader.setFeature("http://apache.org/xml/features/scanner/notify-char-refs", true); xmlReader.setFeature("http://apache.org/xml/features/validation/unparsed-entity-checking", false); xmlReader.setFeature("http://xml.org/sax/features/external-parameter-entities", false); xmlReader.setEntityResolver(this); xmlReader.parse(new InputSource(new StringReader(xml))); } @Override public void startDocument() throws SAXException { super.startDocument(); } public void startEntity(String name) throws SAXException { System.out.println("Start ent: " + name); } public void endEntity(String name) throws SAXException { } public void startCDATA() throws SAXException { } public void endCDATA() throws SAXException { } public void startDTD(String name, String publicId, String systemId) throws SAXException { } public void endDTD() throws SAXException { } public void comment(char[] ch, int start, int length) throws SAXException { } } The output when running this is: [Fatal Error] :1:16: The entity "euro" was referenced, but not declared. Exception in thread "main" org.xml.sax.SAXParseException: The entity "euro" was referenced, but not declared. at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at Test.<init>(Test.java:37) It would be really nice to handle this non-well-formed input using XML tools without resorting to a regex replace across every feed... I'm not sure it's possible but the features make it seem like it should be - any ideas? thanks -- Andrew Welch http://andrewjwelch.com Kernow: http://kernowforsaxon.sf.net/
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