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  9   ˆl–Ü4ý(&”ÔD¨ 	Å ýÁ9q¦”Å£Áƒh¹a–Ü4ý(&”ÔD¨ 	Å ýÁ9q¦”Å£Å      1
  *   ˆl–Ãa¾”Še¶¥@ŠàŸ¸Å£Ãƒm–A_†I|¥+ÀÇ Ò    /** 
 * section: 	XPath
 * synopsis: 	Load a document, locate subelements with XPath, modify
 *              said elements and save the resulting document.
 * purpose: 	Shows how to make a full round-trip from a load/edit/save
 * usage:	xpath2 <xml-file> <xpath-expr> <new-value>
 * test:	xpath2 test3.xml '//discarded' discarded > xpath2.tmp && diff xpath2.tmp $(srcdir)/xpath2.res
 * author: 	Aleksey Sanin and Daniel Veillard
 * copy: 	see Copyright for the status of this software.
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>

#if defined(LIBXML_XPATH_ENABLED) && defined(LIBXML_SAX1_ENABLED) && \
    defined(LIBXML_OUTPUT_ENABLED)


static void usage(const char *name);
static int example4(const char *filename, const xmlChar * xpathExpr,
                    const xmlChar * value);
static void update_xpath_nodes(xmlNodeSetPtr nodes, const xmlChar * value);


int 
main(int argc, char **argv) {
    /* Parse command line and process file */
    if (argc != 4) {
	fprintf(stderr, "Error: wrong number of arguments.\n");
	usage(argv[0]);
	return(-1);
    } 
    
    /* Init libxml */     
    xmlInitParser();
    LIBXML_TEST_VERSION

    /* Do the main job */
    if (example4(argv[1], BAD_CAST argv[2], BAD_CAST argv[3])) {
	usage(argv[0]);
	return(-1);
    }

    /* Shutdown libxml */
    xmlCleanupParser();
    
    /*
     * this is to debug memory for regression tests
     */
    xmlMemoryDump();
    return 0;
}

/**
 * usage:
 * @name:		the program name.
 *
 * Prints usage information.
 */
static void 
usage(const char *name) {
    assert(name);
    
    fprintf(stderr, "Usage: %s <xml-file> <xpath-expr> <value>\n", name);
}

/**
 * example4:
 * @filename:		the input XML filename.
 * @xpathExpr:		the xpath expression for evaluation.
 * @value:		the new node content.
 *
 * Parses input XML file, evaluates XPath expression and update the nodes
 * then print the result.
 *
 * Returns 0 on success and a negative value otherwise.
 */
static int 
example4(const char* filename, const xmlChar* xpathExpr, const xmlChar* value) {
    xmlDocPtr doc;
    xmlXPathContextPtr xpathCtx; 
    xmlXPathObjectPtr xpathObj; 
    
    assert(filename);
    assert(xpathExpr);
    assert(value);

    /* Load XML document */
    doc = xmlParseFile(filename);
    if (doc == NULL) {
	fprintf(stderr, "Error: unable to parse file \"%s\"\n", filename);
	return(-1);
    }

    /* Create xpath evaluation context */
    xpathCtx = xmlXPathNewContext(doc);
    if(xpathCtx == NULL) {
        fprintf(stderr,"Error: unable t