Re: How do I parse a DTD in Java?

[Anne Thomas Manes]

That's because a DTD is NOT XML.

At 09:54 AM 1/13/2004, you wrote:
How do I parse a DTD into an in-memory Java object, like a TreeMap or 
perhaps some XML specific collection class?

I asked this question the other day, and got an answer that the 
DocumentBuilder parse method should handle the parsing of a DTD – since a 
DTD IS XML.

However, I get basic parsing errors when inputting a simple DTD.  The code 
works fine on XML documents, but not on DTDs.  The code I’m using to parse 
the DTD looks like this:

     public static void main( String argArgs[] ) {
     {
            File dtdFile = new File( "C:\\APIS\\WorkSpace\\tv.dtd" );
            DocumentBuilderFactory dbf = 
DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document document = db.parse( dtdFile );
            parseChildrenRecursivly( document.getChildNodes();  );
     }

     public void parseChildrenRecursivly( NodeList argNodeList ) {

            if (argNodeList == null) {
                return;
            }
            Node node;
            for (int i=0; i<argNodeList.getLength(); i++) {
                 node = argNodeList.item( i );
                 if (node.getNodeType() != Node.TEXT_NODE) {
                     System.out.println(
                        "node.nodeName = " + node.getNodeName() + "; " 
+
                        "node.nodeType = " + Short.toString( 
node.getNodeType() ) + "; " +
                        "node.localName = " + node.getLocalName() + "; " +
                        "node.namespaceUri = " + node.getNamespaceURI() + 
"; " +
                        "node.nodeValue = " + node.getNodeValue() + "; " +
                        ""
                     );
                     parseChildrenRecursivly( node.getChildNodes() );
                 }
            } // for
     }

However, I get errors when making the attempt:

[Fatal Error] :-1:-1: Premature end of file.
ERR:> Exception Premature end of file.
The DTD I’m trying to parse is just an example.  It looks like this, where 
the elements are embedded inside the DOCTYPE tag:

<!DOCTYPE TVSCHEDULE [

<!ELEMENT TVSCHEDULE (CHANNEL+)>
<!ELEMENT CHANNEL (BANNER, DAY+)>
<!ELEMENT BANNER (#PCDATA)>
<!ELEMENT DAY ((DATE, HOLIDAY) | (DATE, PROGRAMSLOT+))+>
<!ELEMENT HOLIDAY (#PCDATA)>
<!ELEMENT DATE (#PCDATA)>
<!ELEMENT PROGRAMSLOT (TIME, TITLE, DESCRIPTION?)>
<!ELEMENT TIME (#PCDATA)>
<!ELEMENT TITLE (#PCDATA)>
<!ELEMENT DESCRIPTION (#PCDATA)>
<!ATTLIST TVSCHEDULE NAME CDATA #REQUIRED>
<!ATTLIST CHANNEL CHAN CDATA #REQUIRED>
<!ATTLIST PROGRAMSLOT VTR CDATA #IMPLIED>
<!ATTLIST TITLE RATING CDATA #IMPLIED>
<!ATTLIST TITLE LANGUAGE CDATA #IMPLIED>
]>

If I just parse the ELEMENTS, by removing the DOCTYPE tag, I still get errors:

Exception The markup in the document preceding the root element must be 
well-formed.
[Fatal Error] tv.dtd:3:3: The markup in the document preceding the root 
element must be well-formed.

Anybody have a clue how to parse a DTD, so I can get an in-memory 
structure of the DTD in Java?



----------
Scott Andrews
Principle Software Engineer
Concurrent Technologies Corporation
(814) 269 6580 (Monday, Wednesday, Friday)
(814) 632 9559 (Tuesday, Thursday)
(814) 880 8522 (Cell)



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