How to capture errors in XSLT transformation?

Hello all,

I am using the example posted in the libxslt web page to transform an 
input XML file into HTML, my code is very simple:
-snip-

        // parse XSL
        cur = xsltParseStylesheetFile((const xmlChar *)xslFile_name);
        
        // parse XML
        doc = xmlParseFile(xmlFile_name);
        
        // apply XSL
        res = xsltApplyStylesheet(cur, doc, params);
        
        // display in stdout
        //xsltSaveResultToFile(stdout, res, cur);
        
        // saves formatted file to disk
        xmlSaveFile(formattedFile_name, res);

        // deallocate
        xsltFreeStylesheet(cur);
        xmlFreeDoc(res);
        xmlFreeDoc(doc);
        xsltCleanupGlobals();
        xmlCleanupParser();


-snip-

If for example, the XML is validated against a schema that contains 
namespaces and into the XSL I delete the reference to that Namespace 
location, the file is transformed but erroneously and I get this error 
onto the console...
How can I catch the error in my code? How are managed erros in thei 
library?
THefucntions I call does not rerun an error code I can catch and manage! :(

Any help shall be appreciated

esther

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