XOM API for Processing XML with Java

["Marks, Chris" <chris.marks AT landg.com>]

Sorry, 

I should mention that both sets of code are encased in a try/catch
block, which catches the following exceptions (or not, as the case may
be!!) :

// IO Exception thrown when unable to locate schema definition file
catch (IOException ioe) {
        Log.debug(this, "IOE " + ioe.getMessage());
}
catch (SAXException se) {
        Log.debug(this, "SE " + se.getMessage());
}
catch (ParserConfigurationException pce) {
        Log.debug(this, "PCE " + pce.getMessage());
}
catch (ValidityException ve) {
        Log.debug(this, "VE " + ve.getMessage());
}
// Parsing exception is thrown when validating flag is off and
well-formedness fails
catch (ParsingException pe) {
        Log.debug(this, "PE " + pe.getMessage());
}

Thanks........... 

-----Original Message-----
From: Marks, Chris 
Sent: 25 April 2008 09:49
To: 'xom-interest AT lists.ibiblio.org'
Subject: Schema validation using XOM

Hi,

I've used XOM successfully using a test Websphere workspace (using JRE
5) to schema validate and build a document using XOM. 

However, I'm having trouble doing this using a Websphere workspace using
the default runtime environment.

Using JRE5 the code works fine :

                SchemaFactory sf =
SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema";);
                System.out.println("retrieved SF : " + sf.getClass());
                Schema s = sf.newSchema(ss);
                System.out.println("Schema type : " + s.getClass());
        
                SAXParserFactory spf = SAXParserFactory.newInstance();
                System.out.println("SPF : " + spf.getClass());
                
                spf.setValidating(true);
                spf.setNamespaceAware(true);
                spf.setSchema(s);
        
                SAXParser sp = spf.newSAXParser();
                System.out.println("SAXParser : " + sp.getClass());
                XMLReader reader = sp.getXMLReader();
                System.out.println("XML Reader : " + reader.getClass());
        
                reader.setErrorHandler(new XOMErrorHandler());
                // Overridden by XOM Builder true/false flag
        
reader.setFeature("http://xml.org/sax/features/validation",true);
                
        
reader.setFeature("http://apache.org/xml/features/validation/dynamic",tr
ue);
        
reader.setFeature("http://apache.org/xml/features/validation/schema",tru
e);
                
                // True by default
        
reader.setFeature("http://xml.org/sax/features/namespaces",true);
                        
                is =
XOMtester.class.getResourceAsStream("ExampleProduct.xml");
                
                Builder b = new Builder(reader, true);
                Document d = b.build(is);

And gives the following output :

                retrieved SF : class
com.sun.org.apache.xerces.internal.jaxp.validation.xs.SchemaFactoryImpl
                Schema type : class
com.sun.org.apache.xerces.internal.jaxp.validation.xs.SchemaImpl
                SPF : class org.apache.xerces.jaxp.SAXParserFactoryImpl
                SAXParser : class org.apache.xerces.jaxp.SAXParserImpl
                XML Reader : class
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser
                Validity Exception : cvc-enumeration-valid: Value
'UglyFemale' is not facet-valid with respect to enumeration '[Male,
Female, Unknown]'. It           must be a value from the enumeration.

However, when I'm running under a different runtime environment the XOM
builder does not seem to perform schema validation. I've noticed that
the SchemaFactory that is returned is different from the test workspace,
and I cannot seem to perform schema validation. 

This is the code :

                Log.debug(this, "Validating flag is......" +
validateAgainstSchema);
                SAXParserFactory saxParserFactory =
SAXParserFactory.newInstance();
                Log.debug(this, "retrieved SPF : " +
saxParserFactory.getClass());
                saxParserFactory.setNamespaceAware(true);
                
                if (validateAgainstSchema == true) {
                
                        StreamSource[] ss = new StreamSource[2];
                                
                        is1 =
this.getClass().getResourceAsStream("/Qnbprotectionquoterequestmcontent.
xsd");
                        if (is1 == null) {
                                Log.debug(this, "Cannot locate schema
definition file");
                                throw new IOException("Unable to read
schema definition file for schema validation");
                        }
                        else {
                                Log.debug(this, "Found schema definition
file");
                                ss[1] = new StreamSource(is1);
                        }

                        is2 =
this.getClass().getResourceAsStream("/Origodatatypelibrary.xsd");
                        if (is2 == null) {
                                Log.debug(this, "Cannot locate origo
type definition file");
                                throw new IOException("Unable to read
origo type definition file for schema validation");
                        }
                        else {
                                Log.debug(this, "Found origo type
definition file");
                                ss[0] = new StreamSource(is2);
                        }       
                
                        Log.debug(this, "system property : " +
System.getProperty("javax.xml.validation.SchemaFactory:http://www.w3.org
/2001/XMLSchema"));
                        SchemaFactory schemaFactory =
SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema";);
                        Log.debug(this, "retrieved SF : " +
schemaFactory.getClass());
                        
                        try {
                                schemaFactory.setErrorHandler(new
XOMErrorHandler());
                                Log.debug(this, "Setting schema
object(s)");
                                schema = schemaFactory.newSchema(ss);
                                Log.debug(this, "Schema type : " +
schema.getClass());
                        }
                        catch (SAXException se) {
                                Log.debug(this, "SE1 " +
se.getMessage());
                        }
                        
                        saxParserFactory.setValidating(true);
                        
                        Log.debug(this, "Setting schema in SPF");
                        saxParserFactory.setSchema(schema);
                
                //      is1.close();
                //      is2.close();
                        
                }
                else {
                        saxParserFactory.setValidating(false);
                }
        
                SAXParser saxParser = saxParserFactory.newSAXParser();
                Log.debug(this, "SAXParser : " + saxParser.getClass());
                XMLReader xmlReader = saxParser.getXMLReader();
                Log.debug(this, "XML reader : " + xmlReader.getClass());
                        
                xmlReader.setErrorHandler(new XOMErrorHandler());
                                        // Overridden by XOM Builder
true/false flag
        
xmlReader.setFeature("http://xml.org/sax/features/validation",true);
                                        // These 2 are false by default.
Altering schema validation seems to make no difference
        
xmlReader.setFeature("http://apache.org/xml/features/validation/dynamic";
,true);
        
xmlReader.setFeature("http://apache.org/xml/features/validation/schema";,
true);
        
xmlReader.setFeature("http://apache.org/xml/features/validation/schema-f
ull-checking",true);
                
                // True by default
        
xmlReader.setFeature("http://xml.org/sax/features/namespaces",true);
                
                BufferedReader bufferedReader = new BufferedReader(new
StringReader(origoRequestXML));
                Builder b = new Builder(xmlReader,
validateAgainstSchema);
                doc = b.build(bufferedReader);

Which gives the output :


Validating flag is......true
2008-04-25 09:24:16,516, com.landg.common.logging.Log4JAdapter DEBUG
retrieved SPF : class org.apache.xerces.jaxp.SAXParserFactoryImpl
2008-04-25 09:24:16,531, com.landg.common.logging.Log4JAdapter DEBUG
Found schema definition file
2008-04-25 09:24:16,547, com.landg.common.logging.Log4JAdapter DEBUG
Found origo type definition file
2008-04-25 09:24:16,547, com.landg.common.logging.Log4JAdapter DEBUG
system property : null
2008-04-25 09:24:16,562, com.landg.common.logging.Log4JAdapter DEBUG
retrieved SF : class org.apache.xerces.jaxp.validation.XMLSchemaFactory
2008-04-25 09:24:16,578, com.landg.common.logging.Log4JAdapter DEBUG
Setting schema object(s)
2008-04-25 09:24:16,750, com.landg.common.logging.Log4JAdapter DEBUG
Schema type : class org.apache.xerces.jaxp.validation.SimpleXMLSchema
2008-04-25 09:24:16,750, com.landg.common.logging.Log4JAdapter DEBUG
Setting schema in SPF
2008-04-25 09:24:16,750, com.landg.common.logging.Log4JAdapter DEBUG
SAXParser : class org.apache.xerces.jaxp.SAXParserImpl
2008-04-25 09:24:16,750, com.landg.common.logging.Log4JAdapter DEBUG XML
reader : class org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser
2008-04-25 09:24:16,828, com.landg.common.logging.Log4JAdapter DEBUG
Type : Element. Data : <m_content> which has 7 children and a parent of
[nu.xom.Document: m_content]
2008-04-25 09:24:16,828, com.landg.common.logging.Log4JAdapter DEBUG
Type : Element. Data : <b_control> which has 13 children and a parent of
[nu.xom.Element: m_content]

I've had to define the schema object slightly differently to my test
workspace, by passing in an array of streamsource objects instead of
just one (which contains an xsd:include) since this is the only way I
can construct a schema object that doesn't give some kind of SAX
Exception. 

Apart from the SchemaFactory implementation being used to construct the
schema object being different
(org.apache.xerces.jaxp.validation.XMLSchemaFactory instead of class
com.sun.org.apache.xerces.internal.jaxp.validation.xs.SchemaFactoryImpl)
there is no significant difference in the code. 

Could you please tell me if you think this is likely to be a problem
with the schema object not having been contructed properly, or if you
think that the problem is likely to be something to do with an xmlReader
property (or similar) that isn't being set properly? I have registered
an error handler to the xmlReader but no Log.debug's are being output so
it doesn't appear to be called. 

Many thanks for any assistance you can give.

Chris Marks.

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