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Posted to j-users@xerces.apache.org by Ma...@bundesbank.de on 2004/12/28 17:05:00 UTC
Validation based on nested schema files
Hi,
I have some difficulties while using Xerces-J-2.6.2 in order to parse the
following two XML-files:
=====
a.xml (references schema b and indirectly schema a; validation works)
<?xml version="1.0" encoding="UTF-8"?>
<elemA xmlns=http://www.abc.de/2003-01-01
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.abc.de/2003-01-01
b.xsd">0</elemA>
---
b.xml (references schema b; validation fails)
<?xml version="1.0" encoding="UTF-8"?>
<elemB xmlns=http://www.abc.de/2003-01-01
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.abc.de/2003-01-01
b.xsd">0</elemB>
=====
Nested schema files:
a.xsd:
<?xml version="1.0" encoding="ISO-8859-1"?>
<xs:schema targetNamespace=http://www.abc.de/2003-01-01
xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:element name="elemA" type="xs:string"/>
</xs:schema>
---
b.xsd (b.xsd includes a.xsd, both schemas share the same target namespace):
<?xml version="1.0" encoding="iso-8859-1"?>
<xs:schema targetNamespace=http://www.abc.de/2003-01-01
xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:include schemaLocation="a.xsd"/>
<xs:element name="elemB" type="xs:string"/>
</xs:schema>
=====
While both XML-files seem to match to the schema b (which references schema
a),
XERCES detects the following error while parsing “b.xml” (code see below):
[Error] :3:74: cvc-elt.1: Cannot find the declaration of element
'elemB'.
Does anybody has an idea what could be wrong? I would be very grateful for
a hint.
Cheers
Martin
===
JAVA-Code:
First I create a grammarpool of both schema-files (should me more efficient
if validation is repeated very often). Afterwards I use this grammarpool
in order to validate the XML-files.
---
package de.test.xmlvalidator;
import java.io.File;
import java.io.FileReader;
import java.io.InputStream;
import java.io.Reader;
import org.apache.xerces.impl.Constants;
import org.apache.xerces.parsers.IntegratedParserConfiguration;
import org.apache.xerces.parsers.XMLGrammarPreparser;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.util.XMLGrammarPoolImpl;
import org.apache.xerces.xni.grammars.XMLGrammarDescription;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.apache.xerces.xni.parser.XMLParserConfiguration;
public class TestValidator {
public static void main(String[] args) {
try {
// Step 1: Create grammar
String GRAMMAR_POOL = Constants.XERCES_PROPERTY_PREFIX
+ Constants.XMLGRAMMAR_POOL_PROPERTY;
SymbolTable sym = new SymbolTable(2039);
XMLGrammarPoolImpl grammarPool = new
XMLGrammarPoolImpl();
XMLGrammarPreparser preparser = new
XMLGrammarPreparser(sym);
preparser.setErrorHandler(new PreparserErrorHandler());
preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null);
preparser.setProperty(GRAMMAR_POOL, grammarPool);
preparser.setFeature("http://xml.org/sax/features/namespaces", true);
preparser.setFeature("http://xml.org/sax/features/validation", true);
preparser.setFeature("http://apache.org/xml/features/validation/schema",
true);
preparser.setFeature("http://apache.org/xml/features/validation/schema-full-checking",
true);
String[] schema = {
"/resourcen/xml-schema/a.xsd",
"/resourcen/xml-schema/b.xsd",
};
for (int i = 0; i < schema.length; i++) {
InputStream schemaStream =
TestValidator.class.getClass().getResourceAsStream(schema[i]);
XMLInputSource xis = new XMLInputSource(null, null,
null, schemaStream, null);
preparser.preparseGrammar(XMLGrammarDescription.XML_SCHEMA, xis);
}
// Step 2: Parse files based on schema grammar
XMLParserConfiguration mParserConfiguration = new
IntegratedParserConfiguration(sym, grammarPool);
mParserConfiguration.setFeature("http://xml.org/sax/features/namespaces",
true);
mParserConfiguration.setFeature("http://xml.org/sax/features/validation",
true);
mParserConfiguration.setFeature("http://apache.org/xml/features/validation/schema",
true);
mParserConfiguration.setFeature("http://apache.org/xml/features/validation/schema-full-checking",
true);
// a.xml: Works properly
File file = new
File("C:\\Daten\\Temp\\Auswi\\Eingang\\a.xml");
Reader readerXml = new FileReader(file);
XMLInputSource xis = new XMLInputSource(null, null, null,
readerXml, null);
mParserConfiguration.parse(xis);
// b.xml: Paring fails with message
// "[Error] :3:74: cvc-elt.1: Cannot find the declaration
of element 'elemB'."
file = new
File("C:\\Daten\\Temp\\Auswi\\Eingang\\b.xml");
readerXml = new FileReader(file);
xis = new XMLInputSource(null, null, null, readerXml,
null);
mParserConfiguration.parse(xis);
} catch (Exception e) {
e.printStackTrace();
}
}
}
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