Re: [Exist-development] org.xml.sax.SAXParseException - Prefixed namespace bindings may not be empty.

[Alister P. <gsp...@gm...>]

The error in more detail… Only happening when storing the document, not when parsing.
 
2014-08-31 17:19:02,585 [eXistThread-31] DEBUG (ModuleUtils.java [htmlToXHtml]:251) - Converting HTML to XML using NekoHTML parser for: alternative 
2014-08-31 17:19:03,724 [eXistThread-31] DEBUG (TransactionManager.java [execute]:159) - Starting new transaction: 5 
2014-08-31 17:19:03,730 [eXistThread-31] DEBUG (Collection.java [validateXMLResourceInternal]:1631) - Scanning document /db/test/message-6.xml 
2014-08-31 17:19:03,731 [eXistThread-31] DEBUG (GrammarPool.java [retrieveInitialGrammarSet]:81) - Retrieve initial grammarset (http://www.w3.org/TR/REC-xml). 
2014-08-31 17:19:03,731 [eXistThread-31] DEBUG (GrammarPool.java [retrieveInitialGrammarSet]:85) - Found 0 grammars. 
2014-08-31 17:19:03,740 [eXistThread-31] DEBUG (Indexer.java [fatalError]:419) - fatal error at (58,2064) : The value of the attribute "prefix="xmlns",localpart="o",rawname="xmlns:o"" is invalid. Prefixed namespace bindings may not be empty. 
2014-08-31 17:19:03,740 [eXistThread-31] DEBUG (GrammarPool.java [retrieveInitialGrammarSet]:81) - Retrieve initial grammarset (http://www.w3.org/TR/REC-xml). 
2014-08-31 17:19:03,740 [eXistThread-31] DEBUG (GrammarPool.java [retrieveInitialGrammarSet]:85) - Found 0 grammars. 
2014-08-31 17:19:03,741 [eXistThread-31] ERROR (XMLDBStore.java [evalWithCollection]:220) - The XML parser reported a problem: fatal error at (58,2064) : The value of the attribute "prefix="xmlns",localpart="o",rawname="xmlns:o"" is invalid. Prefixed namespace bindings may not be empty. 
org.xmldb.api.base.XMLDBException: The XML parser reported a problem: fatal error at (58,2064) : The value of the attribute "prefix="xmlns",localpart="o",rawname="xmlns:o"" is invalid. Prefixed namespace bindings may not be empty.
	at org.exist.xmldb.LocalCollection.storeXMLResource(LocalCollection.java:893)
	at org.exist.xmldb.LocalCollection.storeResource(LocalCollection.java:766)
	at org.exist.xmldb.LocalCollection.storeResource(LocalCollection.java:754)

I’ve tried adding a RemoveElement filter to the NekoHTML parser - but can’t make that work - no content is returned. The documentation seems to suggest that I have to add an acceptElement for every element I want to keep - which means all of HTML!!!

Now I’m trying a FilterInputStream approach - but that seems such a blunt instrument - any other suggestions on how to remove <o:p></o:p> from the result of htmlTXHtml?

This is how I modified ModuleUtils.htmlToXHtml 

  LOG.debug("Converting HTML to XML using NekoHTML parser for: " + url);
            reader = (XMLReader) Class.forName("org.cyberneko.html.parsers.SAXParser").newInstance();

            ElementRemover remover = new ElementRemover();
            remover.removeElement("o:p");
            // setup filter chain
            XMLDocumentFilter[] filters = {
                    remover
            };

            reader.setProperty("http://cyberneko.org/html/properties/names/elems","match");
            reader.setProperty("http://cyberneko.org/html/properties/names/attrs","no-change");
            reader.setProperty("http://cyberneko.org/html/properties/filters", filters); // ADDED FILTER here


On 31 Aug 2014, at 6:11 pm, Alister Pillow <gsp...@gm...> wrote:

> Hi,
> Trying to finish off the mail:get-messages function. The error appears when trying to store an email as xml in the /db.
> 
> I’ve hit a nasty little bug - nothing to do with eXist - and (surprise) related to mail from Microsoft Outlook - via Apple Mail. I now suspect that Apple Mail is the culprit.
> 
> I forwarded an email from my Inbox to another account and then retrieved it using mail:get-messages. 
> The original html section is full of <o:p></o:p> tags. These are end-of-paragraph markers inserted by MS Word when creating HTML.
> 
> In the original email, the prefix and namespace is declared - but in the forwarded message, it is missing - consequently I get an error from SAXParser when trying to store this content in the DB. 
> 
> Is there some way to tell the parser to skip these (empty) elements? Or will I have to write a filter for the text before parsing it?
> 
> I’m using Wolfgang’s suggestion:
> DocumentImpl html = ModuleUtils.htmlToXHtml(context, "alternative", new StreamSource(part.getInputStream()), null, null);
> ElementImpl rootElem = (ElementImpl)html.getDocumentElement();
> 
> (Otherwise, mail:get-messages is working quite nicely.)
> 
> Thanks,
> Alister.