question: XML Schema location

19 Mar 2002 09:48:13 -0000

Preliminary remarks: I'm a beginner!
 
I have tried to use XML Schema with Xerces 2.0.1 but I can't locate the xsd file on my file system.
 
I have read the XML Schema Limitations  #usage, so this is the xsd (pattern.xsd):
 

<?xml version="1.0" encoding="utf-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

....

</xs:schema>

 and the xml file:

<?xml version="1.0" encoding="utf-8"?>

<PATTERN xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="pattern.xsd">

....

</PATTERN>

Is it enough? Pattern.xsd is in the same directory with the xml file. This is the validation feature activation:

        try {
            parser.setFeature("http://xml.org/sax/features/validation", true);
        } catch (SAXNotRecognizedException e) {
            System.err.println (e);
        } catch (SAXNotSupportedException e) {
            System.err.println (e);
        }

         //  Turn Schema Validation on
        try {
            parser.setFeature("http://apache.org/xml/features/validation/schema", true);
        } catch (SAXNotRecognizedException e) {
            System.err.println (e);
        } catch (SAXNotSupportedException e) {
            System.err.println (e);
        }

When http://xml.org/sax/features/validation is true the error handler tell me that the element in the xml file must me declared. 
When http://xml.org/sax/features/validation is false the parser work ok but the schema is ignored (infact if I delete it, for the parser is the same thing).
 
I have tried to use namespace, for example:
<document
  xmlns='http://my.com'
  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
  xsi:schemaLocation='http://my.com document.xsd'>
...
</document>

Probably I'm very silly but I can't understand: if the xsd is on my file system instead of http://my.com what have I to write?

 
        String id    = "http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation";
        String value = "pattern.xsd";
        try {
          parser.setProperty(id, value);
        }
        catch (SAXException e) {
          System.err.println("could not set parser properties " + e.getMessage());
        }
 
... but this produce an exception!! (in the DOM parser and in the SAX parses as well).
 
What can I do?
 
These are very stupid question I know, but there aren't tutorial or manual where to learn Xerces usage (or I can't find it).
 
Thank you.
 
Demis.
   

 

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