XML validation using xml schema string 2003-01-20 - By sandygao@(protected)
Write an entity resolver
(http://xml.apache.org/xerces2-j/javadocs/api/org/xml/sax/EntityResolver.html),
and returned an input source with a StringReader when the schema document
is asked.
HTH,
Sandy Gao
Software Developer, IBM Canada
(1-905) 413-3255
sandygao@(protected)
"Praveen Peddi"
<ppeddi@(protected) To: <xerces-j-user@(protected)
.apache.org>
dia.com> cc:
Subject: Re: XML validation
using xml schema string
01/20/2003 09:16
AM
Please respond to
xerces-j-user
Hi all,
Last week I sent an email regarding the xml validation against the schema,
but didn't get any reply. Please reply if any one has answer to my
question. Is it possible to validate an xml document using a schema
document (not the schema url) that is present with in the application. If
its not possible, whats the best way of achieving it. Please read my
previous email below.
Thanks
Praveen
Hi all,
I want to validate an xml document with an existing schema. I know there
is a code to do it when the schema is present as a URL. BUt in my case
schema is present with in the application memory (since it is stored in
the database) and that is not the url or on the hard disk.
I have the following method which validates only when the schema is
present externally. Note that the argument Schema is a URL:
public static void DOMValidate(String XMLfile, String Schema){
long startTime = System.currentTimeMillis();
// Instantiate the DOM parser.
DOMParser parser = new DOMParser();
// set the features
try{
parser.setFeature("http://xml.org/sax/features/namespaces
",true);
parser.setFeature("http://xml.org/sax/features/validation",
true);
parser.setFeature("
http://apache.org/xml/features/validation/schema",true);
parser.setFeature("
http://apache.org/xml/features/validation/schema-full-checking",true);
// convert the xml file name to a URL
String SystemId = null;
try{
SystemId = new File(Schema).toURL().toExternalForm();
} catch(java.net.MalformedURLException ex){
//ex.printStackTrace();
log.error(ex);
}
parser.setProperty("
http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation
",SystemId);
// myErrorHandler is a descendant of ErrorHandler, it should
be set here to be able to catch parse errors
parser.setErrorHandler(new SchemaErrorHandler());
} catch (SAXNotSupportedException ex){
System.out.println("SAXNotSupportedException Exception");
} catch (SAXNotRecognizedException ex){
System.out.println("SAXNotRecognizedException Exception");
}
// parse the xml file, the errorhandler class has callbacks,
// so those will be called automatically there is a parse error
try{
parser.parse(new File(XMLfile).toURL().toExternalForm());
//System.out.println("Parsed Successfully by DOM Parser");
} catch (org.xml.sax.SAXException ex){
//System.out.println("SAXException Exception");
//ex.printStackTrace();
log.error(ex);
} catch (java.io.IOException ex){
System.out.println("IOException Exception");
} finally {
long endTime = System.currentTimeMillis();
//System.out.println("Total time of DOMValidate:"
+(endTime-startTime));
}
}
How can I do the validation if the Schema is the actual schema string not
the url. This looks like a common problem. I assume that its not universal
that schema is not always stored externally.
Any suggestions are appreciated.
Praveen
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