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Posted to j-users@xerces.apache.org by Florian Roth <fl...@synatic.net> on 2004/12/16 16:19:19 UTC
Parse DTD
Hi,
I only want to parse a DTD without validating an XML document against it. I
want to know what attributes a certain element can contain so I digged a bit
in the Xerces doc but found nothing that could satisfy my needs. Any ideas?
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Re: Parse DTD
Posted by Martin Vysny <vy...@host.sk>.
Florian Roth wrote:
>Hi,
>
>I only want to parse a DTD without validating an XML document against it. I
>want to know what attributes a certain element can contain so I digged a bit
>in the Xerces doc but found nothing that could satisfy my needs. Any ideas?
>
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>To unsubscribe, e-mail: xerces-j-user-unsubscribe@xml.apache.org
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>
>
I am using this code when parsing XML and I want to catch all pure-text
entities. Hope that helps. Just use it as a normal parser.
/**
* We are going to parse the XML via Xerces's XNI methods. This is the
* instance of DOMParser used for parsing documents. With its help
we are
* going to catch all entity declarations correctly.
*/
private class Parser extends DOMParser {
/**
* Contains mapping between the entity name and entity value. Maps
* String to String.
*/
public final Map<String, String> textEntities = new
HashMap<String, String>();
public Parser(URLDir root) {
super();
try {
setFeature(Constants.SAX_FEATURE_PREFIX
+ Constants.VALIDATION_FEATURE, false);
// "namespaceAware" == SAX Namespaces feature
setFeature(Constants.SAX_FEATURE_PREFIX
+ Constants.NAMESPACES_FEATURE, true);
// Set various parameters obtained from
DocumentBuilderFactory
setFeature(Constants.XERCES_FEATURE_PREFIX
+ Constants.INCLUDE_IGNORABLE_WHITESPACE, false);
setFeature(Constants.XERCES_FEATURE_PREFIX
+ Constants.CREATE_ENTITY_REF_NODES_FEATURE, true);
setFeature(Constants.XERCES_FEATURE_PREFIX
+ Constants.INCLUDE_COMMENTS_FEATURE, true);
setFeature(Constants.XERCES_FEATURE_PREFIX
+ Constants.CREATE_CDATA_NODES_FEATURE, false);
} catch (SAXNotRecognizedException ex) {
throw new Error(ex);
} catch (SAXNotSupportedException ex) {
throw new Error(ex);
}
}
/*
* (non-Javadoc)
* @see org.apache.xerces.parsers.XMLParser#reset()
*/
public void reset() throws XNIException {
textEntities.clear();
super.reset();
}
/*
* (non-Javadoc)
* @see
org.apache.xerces.xni.XMLDTDHandler#internalEntityDecl(java.lang.String,
* org.apache.xerces.xni.XMLString, org.apache.xerces.xni.XMLString,
* org.apache.xerces.xni.Augmentations)
*/
public void internalEntityDecl(String name, XMLString text,
XMLString nonNormalizedText, Augmentations augs)
throws XNIException {
if (name.charAt(0) != '%') {
// textual entity. store it into the map. Intern them
because
// they may be created multiple times in the document.
textEntities.put(name.intern(), text.toString().intern());
}
super.internalEntityDecl(name, text, nonNormalizedText, augs);
}
}
}
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Re: Parse DTD
Posted by Andy Clark <an...@cyberneko.net>.
Florian Roth wrote:
> Thanks for your help.
> That's exactly what I wanted, but the generated xml looks very
> confusing ... :)
Not so confusing if you are able to read the DTD definition.
Check out the data/dtd/dtdx.dtd grammar file included with the
package for complete details.
> So I have to get the needed information out of it now ... OK, it's just one
> week until vacations, so I should have enough time then
Depending on what you need to do, both DOM and XSLT are useful
tools. For example, using DOM, you can query all of the elements
declarations like so:
NodeList elemDecls = document.getElementsByTagName("elementDecl");
int count = elemDecls.getLength();
for (int i = 0; i < count; i++) {
Element elemDecl = (Element)elemDecls.item(i);
System.out.println("element: "+elemDecl.getAttribute("ename"));
}
Good luck and Happy Holidays!
--
Andy Clark * andyc@apache.org
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Re: Parse DTD
Posted by Florian Roth <fl...@synatic.net>.
Am Freitag, 17. Dezember 2004 04:19 schrieb Andy Clark:
> Florian Roth wrote:
> > I only want to parse a DTD without validating an XML document against
> > it. I want to know what attributes a certain element can contain so I
> > digged a bit in the Xerces doc but found nothing that could satisfy
> > my needs. Any ideas?
>
> The NekoDTD project uses Xerces2 and allows you to parse DTD
> documents, returning their contents as an XML document. Then
> you can use standard XML tools to pull out the info that you
> want. Here's the link:
>
> http://www.apache.org/~andyc/neko/
Thanks for your help.
That's exactly what I wanted, but the generated xml looks very
confusing ... :)
So I have to get the needed information out of it now ... OK, it's just one
week until vacations, so I should have enough time then
Greets
Florian
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Re: Parse DTD
Posted by Andy Clark <an...@cyberneko.net>.
Florian Roth wrote:
> I only want to parse a DTD without validating an XML document against
> it. I want to know what attributes a certain element can contain so I
> digged a bit in the Xerces doc but found nothing that could satisfy
> my needs. Any ideas?
The NekoDTD project uses Xerces2 and allows you to parse DTD
documents, returning their contents as an XML document. Then
you can use standard XML tools to pull out the info that you
want. Here's the link:
http://www.apache.org/~andyc/neko/
--
Andy Clark * andyc@apache.org
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