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https://issues.apache.org/jira/browse/XERCESJ-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233173#comment-13233173
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Michael Glavassevich commented on XERCESJ-1130:
-----------------------------------------------
Hi Shakya,
It's by design that there's only one SchemaGrammar object per namespace. The
schema loader understands how to traverse a graph of schema documents, starting
from a top-level schema with imports and includes. It doesn't know how to merge
the results very well from independent loading requests and wasn't really
designed to do that. I like to think of that more as a design limitation than a
bug in the schema loader. Creating a synthetic schema from the Source[] would
work around the limitation by presenting the schema loader with a single
graph/tree of schema documents.
Thanks,
Michael
> Cannot validate against multiple XML schemas within the same namespace
> ----------------------------------------------------------------------
>
> Key: XERCESJ-1130
> URL: https://issues.apache.org/jira/browse/XERCESJ-1130
> Project: Xerces2-J
> Issue Type: Bug
> Components: XML Schema 1.0 Structures
> Affects Versions: 2.7.1
> Environment: All platforms
> Reporter: Sunitha
> Labels: gsoc, gsoc2012, mentor
>
> The javax.xml.validation.SchemaFactory.newSchema method can take an array of
> schema sources and construct a composite schema. Unfortunately, this does not
> work if the schema are in the same namespace. When the schema are in the same
> namespace, only the first schema is used.
> The bug is caused by the computation of the hashcode for a grammar in the
> grammar cache. The hashcode is computed based only on the namespace of a
> grammar (i.e. schema file). Thus if multiple schemas are specified from the
> same namespace, they will all hash to the same code and only the first will
> be cached and returned for all subsequent caching attempts.
> If each schema is in a separate namespace, the newSchema method works
> properly. Effectively, the assumption that was made in the code was that
> there will only be a single schema per namespace. This is an incorrect
> assumption.
> One of the more major implications of this bug is that the XML Schema
> "include" element can never work since by definition, included schemas must
> be in the same namespace. Because of this bug, inclusion can only be done
> using the "import" element since it supports different namespaces.
> STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
> 1. Create a sample XML file called test.xml
> 2. Create a schema for the test file but split it between two schema files:
> schema1.xsd and schema2.xsd
> 3. Create a java class that uses SAX (DOM shows the same problem) to parse
> the file and extends defaultHandler.
> 4. Call the SchemaFactory.newSchema method with a source array containing
> schema1.xsd and schema2.xsd.
> 5. Set the resulting schema on the parser
> 6. Implement an error method in the class
> 7. Run the program and observe that there is a validation failure. This is
> becuase the second schema in the array was never processed and so the
> validator does not accept the test XML file.
> The source code, test XML file, and schemas are included in this bug report.
> EXPECTED VERSUS ACTUAL BEHAVIOR :
> EXPECTED -
> The test XML file should have validated properly against the composite schema.
> ACTUAL -
> There was a validation failure. This is becuase the second schema in the
> array was never processed and so the validator does not accept the test XML
> file.
> ERROR MESSAGES/STACK TRACES THAT OCCUR :
> SAX Error: http://www.w3.org/TR/xml-schema-1#cvc-elt.1?root
> REPRODUCIBILITY :
> This bug can be reproduced always.
> ---------- BEGIN SOURCE ----------
> ------------- schemaTest.java ----------------------------
> import org.xml.sax.Attributes;
> import org.xml.sax.SAXException;
> import org.xml.sax.SAXParseException;
> import org.xml.sax.helpers.DefaultHandler;
> public class SchemaTest extends DefaultHandler {
> public static void main(String[] args)
> {
> try {
> FileInputStream is = new FileInputStream("test.xml");
>
> StreamSource[] sources = new StreamSource[2];
> FileInputStream ss = new FileInputStream("schema2.xsd");
> sources[0] = new StreamSource(ss);
> ss = new FileInputStream("schema1.xsd");
> sources[1] = new StreamSource(ss);
>
> SchemaFactory schemaFactory =
> SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
> Schema schema = schemaFactory.newSchema(sources);
>
> SAXParserFactory saxFactory = SAXParserFactory.newInstance();
> saxFactory.setNamespaceAware(true);
> saxFactory.setValidating(false);
> saxFactory.setXIncludeAware(true);
> saxFactory.setSchema(schema);
>
> SAXParser parser = saxFactory.newSAXParser();
> parser.parse(is, new SchemaTest());
> }
> catch (FileNotFoundException e) {
> e.printStackTrace();
> }
> catch (SAXException e) {
> e.printStackTrace();
> }
> catch (ParserConfigurationException e) {
> e.printStackTrace();
> }
> catch (IOException e) {
> e.printStackTrace();
> }
> }
> /**
> * @see org.xml.sax.ErrorHandler#warning(org.xml.sax.SAXParseException)
> */
> public void warning(SAXParseException e) throws SAXException
> {
> System.err.println("SAX Warning: " + e.getLocalizedMessage());
> }
> /**
> * @see org.xml.sax.ErrorHandler#error(org.xml.sax.SAXParseException)
> */
> public void error(SAXParseException e) throws SAXException
> {
> System.err.println("SAX Error: " + e.getLocalizedMessage());
> }
> /**
> * @see org.xml.sax.ErrorHandler#fatalError(org.xml.sax.SAXParseException)
> */
> public void fatalError(SAXParseException e) throws SAXException
> {
> System.err.println("SAX Fatal Error: " + e.getLocalizedMessage());
> }
> /**
> * @see org.xml.sax.ContentHandler#startElement(java.lang.String,
> java.lang.String, java.lang.String, org.xml.sax.Attributes)
> */
> public void startElement(String uri, String localName, String qName,
> Attributes attributes) throws SAXException
> {
> System.out.println("Start element: " + localName);
> }
> /**
> * @see org.xml.sax.ContentHandler#endElement(java.lang.String,
> java.lang.String, java.lang.String)
> */
> public void endElement(String uri, String localName, String qName)
> throws SAXException
> {
> System.out.println("End element: " + localName);
> }
> } // End of class SchemaTest
> -------------------- test.xml -------------------------
> <?xml version="1.0"?>
> <root>
> <elem1 value="abc"/>
> </root>
> ---------------- schema1.xsd ------------------------
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema elementFormDefault="qualified" xml:lang="EN"
> xmlns:xs="http://www.w3.org/2001/XMLSchema";>
>
> <xs:include schemaLocation="schema2.xsd"/>
>
> <xs:element name="root">
> <xs:complexType>
> <xs:all>
> <xs:element ref="elem1" minOccurs="0"/>
> </xs:all>
> </xs:complexType>
> </xs:element>
> <xs:element name="elem1">
> <xs:complexType>
> <xs:attribute name="value" type="ValueType" use="required"/>
> </xs:complexType>
> </xs:element>
> </xs:schema>
> --------------------- schema2.xsd ------------------------------
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema elementFormDefault="qualified" xml:lang="EN"
> xmlns:xs="http://www.w3.org/2001/XMLSchema";>
> <xs:simpleType name="ValueType">
> <xs:restriction base="xs:string">
> <xs:enumeration value="abc"/>
> <xs:enumeration value="def"/>
> </xs:restriction>
> </xs:simpleType>
> </xs:schema>
> ---------- END SOURCE ----------
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