XOM API for Processing XML with Java

[Wolfgang Hoschek <whoschek AT lbl.gov>]

> Actually, I perfectly understand that you don't want to implement this
> just for me but I'd greatly appreciate any hints how to best modify  
> the
> sources to minimize the impact.
>
> My idea was to modify Element#addNamespaceDeclaration() to remember  
> the
> fact that is was an explicit addition. It looks like that method is  
> only
> called twice in XOMHandler and twice in NonVerifyingHandler (ignoring
> DOMConverter and XSLTHandler). Now Element should get a new List of
> declared prefixes.  Then, I could ask an element whether the namespace
> was declared here on in some parent element.  Hopefully, that  
> should do
> the trick.


Perhaps it might work for you to add this to Element.java:

    private static final String[] EMPTY = new String[0];

    /**
     * Returns a list of (prefix, URI) pairs in the form prefix0,  
ns0, ...,
     * prefixN, nsN, or an empty array if there are no additional  
namespace
     * declarations on this element.
     */
    public final String[] getAdditionalNamespaceDeclarations() { // WH
            if (namespaces == null) return EMPTY;
            ArrayList prefixes = namespaces.getPrefixes();
            int size = prefixes.size();
            if (size == 0) return EMPTY;
            String[] results = new String[2 * size];
            for (int i=0, j=0; i < size; i++, j += 2) {
                results[j+0] = (String) prefixes.get(i);
                results[j+1] = namespaces.getURI(results[j]);
            }
        return results;
    }

I'm considering to use this myself for some special namespace  
iterations in bnux.
(No, it can't be done with the existing API, at least not in an  
efficient manner)

Wolfgang.