Thanks for the reply Michael, Regarding the JAXP Validation API - I don't really understand how I can use that with XMLReader for document parsing and validation using SAX. Any ideas?
Regards Xerces, I naively assumed that the Sun JDK fork of Xerces would have very minor changes. Subsequently I have downloaded Xerces 2.9.1 and tried this in place of Sun's Xerces fork, unfortunately I am still getting the same problem and have doubly checked that I am now using org.apache.xerces.* classes and not the Sun ones. Again, looking through the (real) Xerces source I see the same comment in Xerces XMLSchemaValidator albeit now on line 1452. // store the external schema locations. they are set when reset is called, // so any other schemaLocation declaration for the same namespace will be // effectively ignored. becuase we choose to take first location hint // available for a particular namespace. Thanks ________________________________________ From: Michael Glavassevich [mailto:[EMAIL PROTECTED] Sent: 10 November 2008 14:36 To: j-users@xerces.apache.org Cc: Bill Michell Subject: RE: Problem validating using XMLGrammarPool with different Grammars with no namespace Hi Adam, The JAXP Validation API seems to support your scenario. See SchemaFactory.newSchema() [1]. Have you tried that? Also, at the risk of sounding like a broken record (already responded to someone else about this yesterday) you obviously weren't using Xerces if you were hitting a breakpoint in com.sun.org.apache.xerces.internal.impl.xs. Anything with com.sun.org.apache.xerces in it is Sun's fork of the Xerces codebase which they ship in their JDK. They've made all sort of modifications to it, giving it behaviour no version of Xerces has ever had and apparently several bugs it has never had either. I wouldn't assume that the Sun version of XMLGrammarPool works as documented in Xerces. Thanks. [1] http://xerces.apache.org/xerces2-j/javadocs/api/javax/xml/validation/SchemaFactory.html#newSchema() Michael Glavassevich XML Parser Development IBM Toronto Lab E-mail: [EMAIL PROTECTED] E-mail: [EMAIL PROTECTED] "Adam Retter" <[EMAIL PROTECTED]> wrote on 11/10/2008 07:16:19 AM: > Thanks for the suggestion. Not sure if that's going to work in my case > though, how will I know which parser to use for which incoming document? > > All documents come in through one entry point in a Servlet (so > effectively multithreaded) > > > Thanks Adam. > > > > -----Original Message----- > From: Bill Michell [mailto:[EMAIL PROTECTED] > Sent: 10 November 2008 12:03 > To: j-users@xerces.apache.org > Subject: RE: Problem validating using XMLGrammarPool with different > Grammars with no namespace > > I hit this crazy bit of schema design myself. > > If you create one parser per schema document, you can give each one its > own caching grammar pool, and re-use them from document to document. > > Of course, things are even more fun if you are parsing from multiple > threads. > > It is possible to share the cached grammar pool (which is thread safe) > amongst multiple parsers (which are not thread safe). > > My code is ugly, and can certainly be adjusted for your use case: > > /** > * @param schemaLocation > * @param preloadGrammars > * @return a DOMParser for the specified schema > * @throws IOException > * @throws XNIException > */ > public static DOMParser domParserWithPrivateGrammarPool(final > URL schemaLocation, final List<URL> preloadGrammars) throws > XNIException, IOException { > final XMLGrammarPool grammarPool = new > XMLGrammarPoolImpl(); > if (preloadGrammars!=null) { > > preloadGrammarsIntoPool(grammarPool,preloadGrammars); > } > final XMLGrammarCachingConfiguration config = new > XMLGrammarCachingConfiguration( > new SymbolTable(), grammarPool); > config.setErrorHandler(new GenericXMLErrorHandler()); > if (schemaLocation!=null) { > config.setFeature(JAXP_VALIDATION_FEATURE, > true); > > config.setFeature(JAXP_SCHEMA_VALIDATION_FEATURE, true); > > config.parseGrammar(XMLConstants.W3C_XML_SCHEMA_NS_URI, > schemaLocation.toString()); > } else { > > config.setFeature(JAXP_VALIDATION_FEATURE,false); > } > return new org.apache.xerces.parsers.DOMParser(config); > } > > /** > * @param grammarPool > * @param preloadGrammars > */ > private static void preloadGrammarsIntoPool(final XMLGrammarPool > grammarPool, final List<URL> preloadGrammars) { > final XMLGrammarPreparser preparser=new > XMLGrammarPreparser(); > > preparser.registerPreparser(XMLGrammarDescription.XML_DTD, null); > > preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null); > preparser.setGrammarPool(grammarPool); > for (final URL grammar:preloadGrammars) { > if (logger.isInfoEnabled()) { > logger.info("Preloading grammar for > "+grammar.toExternalForm()); > } > try { > final InputStream inputStream = new > BufferedInputStream(grammar.openStream()); > final XMLInputSource source=new > XMLInputSource(null,grammar.toURI().getPath(),null,inputStream,null); > if (grammar.getPath().endsWith(".dtd")) > { > > preparser.preparseGrammar(XMLGrammarDescription.XML_DTD, source); > } else { > > preparser.preparseGrammar(XMLGrammarDescription.XML_SCHEMA, source); > } > } catch (final IOException e) { > // Preloading is just for convenience > logger.warn("Error trying to preload > grammar file "+grammar.toExternalForm(), e); > } catch (final URISyntaxException e) { > // Preloading is just for convenience > logger.warn("Error trying to preload > grammar file "+grammar.toExternalForm(), e); > } > } > } > > > -- > Bill Michell > Development Team Leader, Broadcast Platforms, BBC FM&T (Journalism). > > -----Original Message----- > From: Adam Retter [mailto:[EMAIL PROTECTED] > Sent: 10 November 2008 11:23 > To: j-users@xerces.apache.org > Subject: Problem validating using XMLGrammarPool with different Grammars > with no namespace > > Hi Chaps, > > I am having some problems with XMLGrammarPool and I would like to > confirm the cause of this. > > I think that it is because I have a number of different XML documents > that use different XML Schemas, and these all use the same namespace > i.e. no namespace. > > When I create a new XMLGrammarPool and validate document A with Schema 1 > it works, however when I then validate document B with Schema 2 using > the same XMLGrammarPool it fails as it cant find the Schema. Both > document A and document B have no namespace defined. > > e.g. > > <a xsi:noNamespaceSchemaLocation="1.xsd" > xmlns:xsi="xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";> > ... > </a> > > <b xsi:noNamespaceSchemaLocation="2.xsd" > xmlns:xsi="xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";> > ... > </b> > > > Our application needs to validate a number of different incoming XML > documents using their XML Schemas, a number of these documents all have > no namespace and use xsi:noNamespaceSchemaLocation="blah.xsd" to refer > to their Schemas. > > I would like to use an XMLGrammarPool for caching Schemas to improve > performance of the system. I thought that by implementing my own > XMLGrammarPool I would be able to determine the uniqueness of an > XMLSchema by something other than its namespace, e.g. its location. > However this doesn't seem to be the case. > > After some investigation with the debugger: at line 1373 of > XMLSchemaValidator in com.sun.org.apache.xerces.internal.impl.xs (Sun > JDK 1.6.0_06) I see this comment in reset(XMLComponentManager > componentManager) - > > // store the external schema locations. they are set when reset is > called, > // so any other schemaLocation declaration for the same namespace will > be > // effectively ignored. because we choose to take first location hint > // available for a particular namespace. > > > > My question then is how and what do I need to do to get this working? Or > if it is currently possible, then what am I doing wrong? > > > > Thanks > > > Adam Retter > > Landmark Information Group Ltd > 5-7 Abbey Court > Eagle Way > Sowton Industrial Estate > Exeter > Devon > EX2 7HY > > t: +44(0)1392 685403 > w: http://www.landmarkinfo.co.uk > > > > Registered Office: 7 Abbey Court, Eagle Way, Sowton, Exeter, Devon, EX2 > 7HY > Registered Number 2892803 Registered in England and Wales > > This email has been scanned by the MessageLabs Email Security System. > For more information please visit http://www.messagelabs.com/email > > The information contained in this e-mail is confidential and may be > subject to > legal privilege. If you are not the intended recipient, you must not > use, copy, > distribute or disclose the e-mail or any part of its contents or take > any > action in reliance on it. If you have received this e-mail in error, > please > e-mail the sender by replying to this message. 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