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//opt/xml2/share/doc/libxml2-2.9.2/html/tree1.c

/**
 * section: Tree
 * synopsis: Navigates a tree to print element names
 * purpose: Parse a file to a tree, use xmlDocGetRootElement() to
 *          get the root element, then walk the document and print
 *          all the element name in document order.
 * usage: tree1 filename_or_URL
 * test: tree1 test2.xml > tree1.tmp && diff tree1.tmp $(srcdir)/tree1.res
 * author: Dodji Seketeli
 * copy: see Copyright for the status of this software.
 */
#include <stdio.h>
#include <libxml/parser.h>
#include <libxml/tree.h>

#ifdef LIBXML_TREE_ENABLED

/*
 *To compile this file using gcc you can type
 *gcc `xml2-config --cflags --libs` -o xmlexample libxml2-example.c
 */

/**
 * print_element_names:
 * @a_node: the initial xml node to consider.
 *
 * Prints the names of the all the xml elements
 * that are siblings or children of a given xml node.
 */
static void
print_element_names(xmlNode * a_node)
{
    xmlNode *cur_node = NULL;

for (cur_node = a_node; cur_node; cur_node = cur_node->next) {
        if (cur_node->type == XML_ELEMENT_NODE) {
            printf("node type: Element, name: %s\n", cur_node->name);
        }

print_element_names(cur_node->children);
    }
}

/**
 * Simple example to parse a file called "file.xml", 
 * walk down the DOM, and print the name of the 
 * xml elements nodes.
 */
int
main(int argc, char **argv)
{
    xmlDoc *doc = NULL;
    xmlNode *root_element = NULL;

if (argc != 2)
        return(1);

/*
     * this initialize the library and check potential ABI mismatches
     * between the version it was compiled for and the actual shared
     * library used.
     */
    LIBXML_TEST_VERSION

/*parse the file and get the DOM */
    doc = xmlReadFile(argv[1], NULL, 0);

if (doc == NULL) {
        printf("error: could not parse file %s\n", argv[1]);
    }

/*Get the root element node */
    root_element = xmlDocGetRootElement(doc);

print_element_names(root_element);

/*free the document */
    xmlFreeDoc(doc);

/*
     *Free the global variables that may
     *have been allocated by the parser.
     */
    xmlCleanupParser();

return 0;
}
#else
int main(void) {
    fprintf(stderr, "Tree support not compiled in\n");
    exit(1);
}
#endif