[xml] XDS parsing

[Marcelo Elias Del Valle <mvallebr yahoo com br>]

Hello, 

I am new to xml and on the list. I was searching the example codes and I found 
the following:
static void

    xmlParserCtxtPtr ctxt; /* the parser context */
    xmlDocPtr doc; /* the resulting document tree */
    /* create a parser context */
    ctxt = xmlNewParserCtxt();
    /* parse the file, activating the DTD validation option */
    doc = xmlCtxtReadFile(ctxt, filename, NULL, XML_PARSE_DTDVALID);
        ...

        This validades the parsed file with DTD. However, I would like to validate a 
xml using XSD, through a namespace definition. How could it be done?

Thanks in advance,

Marcelo.