[jdom-interest] JDOM and XML Schema

[Phillip Beauvoir]

Hi there:

thanks for that very helpful information.  The only problem I'm having is the 3 parameters to XMLInputSource.  What do I use?  You get yours from the DocType.  I can't do that.  I wrote this:


            String schemaFile = "d:\\myschema.xsd";

            org.apache.xerces.xni.parser.XMLInputSource in =
                new org.apache.xerces.xni.parser.XMLInputSource(
                    schemaFile,
                    schemaFile,
                    schemaFile);

            in.setCharacterStream(new FileReader(schemaFile));

            org.apache.xerces.impl.xs.XMLSchemaLoader loader =
                new org.apache.xerces.impl.xs.XMLSchemaLoader();

            org.apache.xerces.xni.grammars.Grammar grammar = loader.loadGrammar(in);

            org.apache.xerces.xni.grammars.XSGrammar xsgrammar =
                (org.apache.xerces.xni.grammars.XSGrammar)grammar;

            org.apache.xerces.impl.xs.psvi.XSModel xsmodel = xsgrammar.toXSModel();

  ----- Original Message ----- 
  From: Kenneth Ellefsen 
  To: Phillip Beauvoir 
  Cc: jdom-interest at jdom.org 
  Sent: Friday, November 29, 2002 12:47 PM
  Subject: Re: [jdom-interest] JDOM and XML Schema


  Hi,

  I ended up reinventing the wheel when I needed to use my DTD file...

  Maby the difference between DTD/schema isn't that big...

  Anyway, if it helps....


  I have now made the following piece of code that solves my problem with
  retreving a DTD enumeration of valid values for a given attribute.

  Posting it here in case someone else can have a use for it.



  // e is an org.jdom.Element
  // replace sertain static strings as you need


  org.jdom.DocType dt = e.getDocument().getDocType();


  // Load and parse the DTD file...

  org.apache.xerces.impl.dtd.XMLDTDLoader dtdloader =
  new org.apache.xerces.impl.dtd.XMLDTDLoader();
      
  org.apache.xerces.xni.parser.XMLInputSource input =
  new org.apache.xerces.xni.parser.XMLInputSource(
     dt.getPublicID(),
     "/full/path/to/dtdfile/"+dt.getSystemID(),
     //^^this is the absolute path to the dtd file^^
     dt.getSystemID());
     
  org.apache.xerces.impl.dtd.DTDGrammar grammar = null;
  try{
     grammar =(org.apache.xerces.impl.dtd.DTDGrammar)
     dtdloader.loadGrammar(input);
  }
  catch(Exception ex){
     System.out.println("Error when reading DTD:\n\n"+ex);
     return;
  }


  // And now for the interesting part where
  // we search for the element/attribute name in the DTD

  org.apache.xerces.impl.dtd.XMLAttributeDecl att = 
  new org.apache.xerces.impl.dtd.XMLAttributeDecl();

  org.apache.xerces.impl.dtd.XMLElementDecl elm = 
  new org.apache.xerces.impl.dtd.XMLElementDecl();
        
  String[] enum = null;
  String elmName = e.getName();

        
  int i = grammar.getFirstElementDeclIndex();

  while( grammar.getElementDecl(i,elm) &&
         !elm.name.localpart.equals(elmName) )
  {
     i = grammar.getNextElementDeclIndex(i);
  }

        
  int j = grammar.getFirstAttributeDeclIndex(i);
        
  while( grammar.getAttributeDecl(j, att) &&
         !att.name.localpart.equals("value") )
  {
     j = grammar.getNextAttributeDeclIndex(j);
  }

  enum = att.simpleType.enumeration;

  // enum - contains ether null, or a String[] representing
  // the (value1|value2|value3) definition of attribute "value"
  // for the element in question




  On Fri, 2002-11-29 at 13:01, Phillip Beauvoir wrote:
  > Hi there!
  > 
  > Sorry if this has been asked before.
  > 
  > I'm loading an XML Schema file into a JDOM document and then trying to create a hierarchical model with accessor methods to query various parts of the Schema to control an XML Editor.  Then I realise that surely somebody must have done this already?  Basically I want to:
  > 
  > 1.  Read the XML Schema into a JDOM Document (easy, I can do this)
  > 2.  Write an API to access the Schema Elements, Constraints, etc.
  > 
  > Anybody know if this has been done already, saving me re-inventing the wheel?
  > 
  > Cheers!
  > 
  > Phil Beauvoir
  -- 
  Mvh,

  Kenneth Ellefsen                   | Tlf: (+47) 55985829
  Schlumberger Information Solutions | www.sis.slb.com


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://jdom.org/pipermail/jdom-interest/attachments/20021129/6c64593d/attachment.htm