Something

static void print_element_names(xmlNode * a_node)
{
    xmlNode *cur_node = NULL;
    xmlNode *test = NULL;
    cur_node = a_node;
    while(cur_node != NULL)
    {
        printf("%s\n", cur_node->name);
        if(cur_node->children != NULL)
        {
            print_element_names(cur_node->children);

        }
        cur_node = cur_node->next;
    }
}

<modules>
    <module name="openvz">
        <function api_call="create_vz" symbol="vzctl_create" role="foo,bar" ret_type="1" argc="1" />
        <function api_call="destroy_vz" symbol="vzctl_destory" role="foo,bar" ret_type="1" argc="1" />
    </module>
    <module name="IRC">
        <function api_call="irc_connect" symbol="connect" role="bar,foo" ret_type="1" argc="1" />
    </module>
</modules>