FAQs

[Ke...@tertio.com]

All,

I would like some info on how to make the Xerces DOM parser (1.1.3)
validate some simple XML using a DTD. I am new to the XML world and
relatively new to the Java world.

I have set the relevant feature as follows:

        domParser = new DOMParser();
        try {
            domParser.setFeature("http://xml.org/sax/features/validation", true);
        } catch (SAXException e) {
            System.out.println("error in setting up parser feature");
        }

But when I parse some simple (and deliverately invalid) XML in a document that contradicts my DTD definitions it fails.

Just in case it's me being stupid, and not getting what XML validation using DTDs is all about, a little snippet if the XML file being parsed and the
DTD it references
are given below:

The DTD is:


<?xml encoding="US-ASCII"?>

<!ELEMENT Proc (Parameters,Comment?,FirstBlock,LastSequence)>
<!ATTLIST Proc
  name CDATA #REQUIRED
  seq ID #REQUIRED>
<!ELEMENT Parameters (Parameter)*>
<!ELEMENT Parameter (Type,Name)>
<!ELEMENT Type (#PCDATA)>
<!ELEMENT Name (#PCDATA)>
<!ELEMENT Comment (#PCDATA)>
<!ELEMENT FirstBlock (#PCDATA)>
<!ELEMENT LastSequence (#PCDATA)>



The XML file is:

<?xml version="1.0"?>
<!DOCTYPE STAN-test SYSTEM "test.dtd">


  <Proc name="ManualLocationkev" seq="0">
    <Parameters>
      <Parameter>
        <XType>byValue</XType>
        <Name>smsMsg</Name>
      </Parameter>
    </Parameters>
    <Comment>top level handling of SMS message</Comment>
    <FirstBlock>1</FirstBlock>
    <LastSequence>99</LastSequence>
  </Proc>

My understanding is that the XML file is invalid based on the DTD file - as the "Parameter" element requires both a "Type"
and a "Name" element. However, when this file is parsed, the parser throws no exceptions.

I am missing something really basic ?

Thanks

Kev Shaw

Tertio Limited  -  One Angel Square,   Torrens Street,   London  EC1V 1PL
Tel: +44 (0)207 843 4000 Fax: +44 (0)207 843 4001 Web http://www.tertio.com
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Re: FAQs

[Andy Clark <an...@apache.org>]

Kevin_Shaw@tertio.com wrote:
> I am missing something really basic ?

Create an ErrorHandler and register the handler so that you 
receive callbacks based on the validation errors found in the
document.

-- 
Andy Clark * IBM, JTC - Silicon Valley * andyc@apache.org