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schema.c
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/**
* @file schema.c
* Utilities for validating paths against the XML schema.
*
* Copyright 2016, Allied Telesis Labs New Zealand, Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>
*/
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <ctype.h>
#include <string.h>
#include <glib.h>
#include <dirent.h>
#include <fnmatch.h>
#include <syslog.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <jansson.h>
#include <regex.h>
#include <apteryx.h>
#include "apteryx-xml.h"
/* Error handling and debug */
static __thread sch_err tl_error = 0;
static __thread char tl_errmsg[BUFSIZ] = {0};
#define DEBUG(flags, fmt, args...) \
if (flags & SCH_F_DEBUG) \
{ \
syslog (LOG_DEBUG, fmt, ## args); \
printf (fmt, ## args); \
}
#define ERROR(flags, error, fmt, args...) \
{ \
tl_error = error; \
snprintf (tl_errmsg, BUFSIZ - 1, fmt, ## args); \
DEBUG (flags, fmt"\n", ## args); \
}
#define READ_BUF_SIZE 512
typedef struct _sch_instance
{
xmlDoc *doc;
GList *models_list;
GHashTable *map_hash_table;
GHashTable *model_hash_table;
GList *regexes;
} sch_instance;
typedef enum
{
ITEM_STATE_INIT,
ITEM_STATE_PENDING,
ITEM_STATE_DONE
} item_state;
typedef struct _sch_load_item
{
char *filename;
char *d_name;
xmlDoc *doc_new;
GList *dependencies;
char *default_href;
item_state state;
} sch_load_item;
/* Retrieve the last error code */
sch_err
sch_last_err (void)
{
return tl_error;
}
/* Retrieve the last error message */
const char *
sch_last_errmsg (void)
{
return tl_errmsg;
}
/* List keys must escape any '/' which is the only reserved
character in apteryx */
static char *
sch_key_encode (const char *key)
{
GString *encoded = g_string_new (NULL);
const char *c = key;
while (c && *c)
{
if (*c == '/')
g_string_append_printf (encoded, "%%%02X", *c);
else
g_string_append_c (encoded, *c);
c++;
}
return g_string_free (encoded, false);
}
/* We decode all escaped special characters except '/'(%2F) as
it is a reserved character in apteryx. */
static char *
sch_key_decode (const char *key)
{
GString *decoded = g_string_new (NULL);
const char *c = key;
while (c && *c)
{
uint8_t value;
if (*c == '%' && c[1] && c[2] &&
isxdigit (c[1]) && isxdigit (c[2]) &&
sscanf (c, "%%%02hhx", &value) == 1 &&
value != 0x2F)
{
g_string_append_c (decoded, value);
c +=3;
}
else
{
g_string_append_c (decoded, *c);
c++;
}
}
return g_string_free (decoded, false);
}
static void
list_doc_ns_dependencies (GList *files, sch_load_item *item)
{
xmlNode *node = xmlDocGetRootElement (item->doc_new);
xmlNs *ns = node->nsDef;
GList *iter;
sch_load_item *list_item;
while (ns)
{
if (ns->href && strstr ((char *) ns->href, "www.w3.org/2001/XMLSchema-instance") == NULL &&
g_strcmp0 ((char *) ns->href, item->default_href) != 0)
{
/* Find the namespace from the loaded models default name spaces */
for (iter = g_list_first (files); iter; iter = g_list_next (iter))
{
list_item = iter->data;
if (list_item->default_href &&
g_strcmp0 (list_item->default_href, (char *) ns->href) == 0)
{
item->dependencies = g_list_append (item->dependencies, list_item);
break;
}
}
}
ns = ns->next;
}
}
static void
resolve_model_dependencies (GList *list, GList **sorted)
{
GList *iter;
sch_load_item *item;
for (iter = g_list_first (list); iter; iter = g_list_next (iter))
{
item = iter->data;
if (item->state != ITEM_STATE_DONE)
{
if (item->state != ITEM_STATE_PENDING)
item->state = ITEM_STATE_PENDING;
else
{
/* Circular dependency - break loop */
return;
}
if (item->dependencies)
{
resolve_model_dependencies (item->dependencies, sorted);
}
item->state = ITEM_STATE_DONE;
*sorted = g_list_append (*sorted, item);
}
}
}
static gint
sort_schema_files (gconstpointer a, gconstpointer b)
{
const sch_load_item *item1 = a;
const sch_load_item *item2 = b;
return strcmp (item1->d_name, item2->d_name);
}
/* List full paths for all schema files in the search path */
static void
load_schema_files (GList ** files, const char *path)
{
DIR *dp;
struct dirent *ep;
char *saveptr = NULL;
char *cpath;
char *dpath;
sch_load_item *new_item;
sch_load_item *item;
GList *iter;
GList *sorted = NULL;
xmlNode *node;
xmlNs *ns;
cpath = g_strdup (path);
dpath = strtok_r (cpath, ":", &saveptr);
while (dpath != NULL)
{
dp = opendir (dpath);
if (dp != NULL)
{
while ((ep = readdir (dp)))
{
if ((fnmatch ("*.xml", ep->d_name, FNM_PATHNAME) != 0) &&
(fnmatch ("*.xml.gz", ep->d_name, FNM_PATHNAME) != 0) &&
(fnmatch ("*.map", ep->d_name, FNM_PATHNAME) != 0))
{
continue;
}
new_item = g_malloc0 (sizeof (sch_load_item));
if (dpath[strlen (dpath) - 1] == '/')
new_item->filename = g_strdup_printf ("%s%s", dpath, ep->d_name);
else
new_item->filename = g_strdup_printf ("%s/%s", dpath, ep->d_name);
new_item->d_name = g_strdup (ep->d_name);
if (fnmatch ("*.map", ep->d_name, FNM_PATHNAME) != 0)
{
new_item->doc_new = xmlParseFile (new_item->filename);
if (new_item->doc_new == NULL)
{
syslog (LOG_ERR, "XML: failed to parse \"%s\"", new_item->filename);
g_free (new_item->filename);
g_free (new_item);
continue;
}
}
*files = g_list_append (*files, new_item);
}
(void) closedir (dp);
}
dpath = strtok_r (NULL, ":", &saveptr);
}
free (cpath);
*files = g_list_sort (*files, sort_schema_files);
/* Get the default href for the models */
for (iter = g_list_first (*files); iter; iter = g_list_next (iter))
{
item = iter->data;
if (item->doc_new)
{
node = xmlDocGetRootElement (item->doc_new);
ns = xmlSearchNs (item->doc_new, node, NULL);
if (ns)
item->default_href = (char *) ns->href;
}
}
/* Record any model dependencies */
for (iter = g_list_first (*files); iter; iter = g_list_next (iter))
{
item = iter->data;
if (item->default_href)
list_doc_ns_dependencies (*files, item);
}
resolve_model_dependencies (*files, &sorted);
g_list_free (*files);
*files = sorted;
return;
}
static bool
sch_ns_node_equal (xmlNode * a, xmlNode * b)
{
char *a_name = NULL;
char *b_name = NULL;
bool ret = false;
/* Must have matching names */
a_name = (char *) xmlGetProp (a, (xmlChar *) "name");
b_name = (char *) xmlGetProp (b, (xmlChar *) "name");
if (g_strcmp0 (a_name, b_name) != 0)
{
goto exit;
}
/* Must have matching namespaces */
if ((a->ns == b->ns) ||
(a->ns && b->ns && g_strcmp0 ((const char *)a->ns->href, (const char *)b->ns->href) == 0))
{
ret = true;
}
exit:
free (a_name);
free (b_name);
return ret;
}
static void
insert_in_order (xmlNs *ns, xmlNode *parent, xmlNode *child)
{
xmlNode *sibling = NULL;
/* Add nodes for the current model before any augmentations */
if (ns && child->ns && g_strcmp0 ((char *) ns->href, (char *) child->ns->href) == 0)
{
sibling = parent->children;
while (sibling)
{
if (g_strcmp0 ((char *) ns->href, (char *) sibling->ns->href) != 0)
break;
sibling = sibling->next;
}
}
if (sibling)
{
if (child->parent)
xmlUnlinkNode (child);
// printf ("Adding %s after %s\n", xmlGetProp (child, (xmlChar *)"name"), xmlGetProp (sibling, (xmlChar *)"name"));
xmlAddNextSibling (sibling, child);
}
else if (!child->parent)
{
// printf ("Adding %s to end\n", xmlGetProp (child, (xmlChar *)"name"));
xmlAddChild (parent, child);
}
}
/* Merge nodes from a new tree to the original tree */
static void
merge_nodes (xmlNs * ns, xmlNode * parent, xmlNode * orig, xmlNode * new, int depth)
{
xmlNode *n;
xmlNode *o;
for (n = new; n; n = n->next)
{
xmlAttr* attribute = n->properties;
/* Check if this node is already in the existing tree */
for (o = orig; o; o = o->next)
{
if (sch_ns_node_equal (n, o))
{
/* Check to see if the model names match */
xmlChar *mod_n = xmlGetProp (n, (xmlChar *)"model");
if (mod_n)
{
xmlChar *mod_o = xmlGetProp (o, (xmlChar *)"model");
if (mod_o)
{
if (g_strcmp0 ((char *) mod_o, (char *) mod_n) != 0)
{
xmlChar *name = xmlGetProp (n, (xmlChar *)"name");
syslog (LOG_ERR, "XML: Conflicting model names in same namespace \"%s:%s\" \"%s:%s\"",
(char *) mod_o, (char *) name, (char *) mod_n, (char *) name);
xmlFree (name);
}
xmlFree (mod_o);
}
xmlFree (mod_n);
}
/* Merge into the original node any new attributes from the new node */
while (attribute && attribute->name && attribute->children)
{
if (!xmlHasProp (o, attribute->name))
{
xmlChar* value = xmlNodeListGetString (n->doc, attribute->children, 1);
xmlSetProp (o, attribute->name, value);
xmlFree (value);
}
attribute = attribute->next;
}
break;
}
}
if (o)
{
/* Already exists - merge in the children */
merge_nodes (ns, o, o->children, n->children, depth + 1);
if (depth > 0)
insert_in_order (ns, parent, o);
}
else
{
/* New node */
o = xmlCopyNode (n, 1);
if (depth > 0)
insert_in_order (ns, parent, o);
else
xmlAddChild (parent, o);
}
}
}
/* Remove unwanted nodes and attributes from a parsed tree */
static void
cleanup_nodes (xmlNode * node)
{
xmlNode *n, *next;
n = node;
while (n)
{
next = n->next;
if (n->type == XML_ELEMENT_NODE)
{
cleanup_nodes (n->children);
}
else
{
xmlUnlinkNode (n);
xmlFreeNode (n);
}
n = next;
}
}
/* Add module organisation and revision to the first child(ren) that matches the namespace */
static void
add_module_info_to_children (xmlNode *node, xmlNsPtr ns, xmlChar *mod, xmlChar *org,
xmlChar *ver, xmlChar *feat, xmlChar *devi)
{
xmlNode *n = node;
while (n)
{
if (n->ns && g_strcmp0 ((char *)n->ns->href, (char *)ns->href) == 0)
{
if (!xmlHasProp (n, (const xmlChar *)"model"))
{
xmlNewProp (n, (const xmlChar *)"model", mod);
xmlNewProp (n, (const xmlChar *)"organization", org);
xmlNewProp (n, (const xmlChar *)"version", ver);
xmlNewProp (n, (const xmlChar *)"features", feat);
xmlNewProp (n, (const xmlChar *)"deviations", devi);
}
}
else
{
add_module_info_to_children (n->children, ns, mod, org, ver, feat, devi);
}
n = n->next;
}
}
static void
add_module_info_to_child (sch_instance *instance, xmlNode *module)
{
xmlChar *mod = xmlGetProp (module, (xmlChar *) "model");
if (mod)
{
xmlChar *org = xmlGetProp (module, (xmlChar *) "organization");
xmlChar *ver = xmlGetProp (module, (xmlChar *) "version");
xmlChar *feat = xmlGetProp (module, (xmlChar *) "features");
xmlChar *devi = xmlGetProp (module, (xmlChar *) "deviations");
xmlNsPtr def = xmlSearchNs (module->doc, module, NULL);
add_module_info_to_children (module->children, def, mod, org, ver, feat, devi);
xmlFree (mod);
if (org)
xmlFree (org);
if (ver)
xmlFree (ver);
if (feat)
xmlFree (feat);
if (devi)
xmlFree (devi);
}
}
static bool
save_module_info (sch_instance *instance, xmlNode *module)
{
sch_loaded_model *loaded;
bool add = true;
xmlChar *mod = xmlGetProp (module, (xmlChar *) "model");
xmlChar *org = xmlGetProp (module, (xmlChar *) "organization");
xmlChar *ver = xmlGetProp (module, (xmlChar *) "version");
xmlChar *feat = xmlGetProp (module, (xmlChar *) "features");
xmlChar *devi = xmlGetProp (module, (xmlChar *) "deviations");
if (instance->model_hash_table)
{
if (!mod || strlen ((char *) mod ) == 0 ||
!g_hash_table_lookup (instance->model_hash_table, (const char *) mod))
{
if (mod)
xmlFree (mod);
if (org)
xmlFree (org);
if (ver)
xmlFree (ver);
if (feat)
xmlFree (feat);
if (devi)
xmlFree (devi);
return false;
}
}
if (mod)
{
/* Check for duplicate model information being saved into the list of models */
for (GList *iter = g_list_first (instance->models_list); iter;
iter = g_list_next (iter))
{
loaded = iter->data;
if (g_strcmp0 ((char *) mod, loaded->model) == 0)
{
/* We have a duplicate model */
add = false;
}
}
}
if (add)
{
loaded = g_malloc0 (sizeof (sch_loaded_model));
if (loaded)
{
if (module->ns)
{
if (module->ns->href)
{
loaded->ns_href = g_strdup ((char *) module->ns->href);
}
if (module->ns->prefix)
{
loaded->ns_prefix = g_strdup ((char *) module->ns->prefix);
}
}
else
{
xmlChar *nsp = xmlGetProp (module, (xmlChar *) "namespace");
xmlChar *pre = xmlGetProp (module, (xmlChar *) "prefix");
if (nsp)
{
loaded->ns_href = (char *) nsp;
}
if (pre)
{
loaded->ns_prefix = (char *) pre;
}
}
if (mod)
{
loaded->model = g_strdup ((char *) mod);
}
if (org)
{
loaded->organization = g_strdup ((char *) org);
}
if (ver)
{
loaded->version = g_strdup ((char *) ver);
}
if (feat)
{
loaded->features = g_strdup ((char *) feat);
}
if (devi)
{
loaded->deviations = g_strdup ((char *) devi);
}
instance->models_list = (void *) g_list_append (instance->models_list, loaded);
}
}
if (mod)
xmlFree (mod);
if (org)
xmlFree (org);
if (ver)
xmlFree (ver);
if (feat)
xmlFree (feat);
if (devi)
xmlFree (devi);
return true;
}
static void
copy_nsdef_to_root (xmlDoc *doc, xmlNode *node)
{
xmlNode *n = node;
while (n)
{
/* Copy any NS defintions to the new root */
xmlNsPtr ns = n->nsDef;
while (ns)
{
if (ns->href && !xmlSearchNsByHref (doc, xmlDocGetRootElement (doc), ns->href))
{
char *prefix = (char *) ns->prefix;
if (!prefix)
prefix = (char *) xmlGetProp (n, (xmlChar *)"prefix");
if (prefix)
xmlNewNs (xmlDocGetRootElement (doc), ns->href, (xmlChar *)prefix);
if (!ns->prefix)
free (prefix);
}
ns = ns->next;
}
/* Recurse */
copy_nsdef_to_root (doc, n->children);
n = n->next;
}
}
void
assign_ns_to_root (xmlDoc *doc, xmlNode *node)
{
xmlNode *n = node;
while (n)
{
/* Assign this nodes ns to the new root if needed */
if (n->ns)
n->ns = xmlSearchNsByHref (doc, xmlDocGetRootElement (doc), n->ns->href);
/* Recurse */
assign_ns_to_root (doc, n->children);
/* Chuck away the local NS */
if (n->nsDef) {
xmlFreeNsList (n->nsDef);
n->nsDef = NULL;
}
n = n->next;
}
}
static void
sch_load_namespace_mappings (sch_instance *instance, const char *filename)
{
FILE *fp = NULL;
gchar **ns_names;
char *buf;
if (!instance)
return;
buf = g_malloc0 (READ_BUF_SIZE);
fp = fopen (filename, "r");
if (fp && buf)
{
if (!instance->map_hash_table)
instance->map_hash_table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
while (fgets (buf, READ_BUF_SIZE, fp) != NULL)
{
/* Skip comment lines */
if (buf[0] == '#')
continue;
/* Remove any trailing LF */
buf[strcspn(buf, "\n")] = '\0';
ns_names = g_strsplit (buf, " ", 2);
if (ns_names[0] && ns_names[1])
{
/* Insert will take care of duplicates automatically. */
g_hash_table_insert (instance->map_hash_table, g_strdup (ns_names[0]),
g_strdup (ns_names[1]));
}
g_strfreev (ns_names);
}
fclose (fp);
}
g_free (buf);
}
static void
sch_load_model_list (sch_instance *instance, const char *path, const char *model_list_filename)
{
FILE *fp = NULL;
char *name;
char *buf;
if (!instance)
return;
buf = g_malloc0 (READ_BUF_SIZE);
name = g_strdup_printf ("%s/%s", path, model_list_filename);
fp = fopen (name, "r");
if (fp && buf)
{
if (!instance->model_hash_table)
instance->model_hash_table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
while (fgets (buf, READ_BUF_SIZE, fp) != NULL)
{
/* Skip comment lines */
if (buf[0] == '#')
continue;
/* Remove any trailing LF */
buf[strcspn(buf, "\n")] = '\0';
if (strlen (buf) > 0)
{
void *old_key;
void *old_value;
/* Look up this node name to check for duplicates. */
if (g_hash_table_lookup_extended (instance->model_hash_table, buf,
&old_key, &old_value))
{
g_free (old_key);
g_free (old_value);
}
else
{
g_hash_table_insert (instance->model_hash_table, g_strdup (buf),
g_strdup (buf));
}
}
}
fclose (fp);
}
g_free (name);
g_free (buf);
}
void
sch_load_item_free (void *data)
{
sch_load_item *item = data;
g_free (item->filename);
g_free (item->d_name);
g_list_free (item->dependencies);
g_free (item);
}
/* Parse all XML files in the search path and merge trees */
static sch_instance *
_sch_load (const char *path, const char *model_list_filename)
{
sch_instance *instance;
xmlNode *module;
xmlNs *ns;
GList *files = NULL;
GList *iter;
/* New instance */
instance = g_malloc0 (sizeof (sch_instance));
/* Create a new doc and root node for the merged MODULE */
instance->doc = xmlNewDoc ((xmlChar *) "1.0");
module = xmlNewNode (NULL, (xmlChar *) "MODULE");
ns = xmlNewNs (module, (const xmlChar *) "https://github.com/alliedtelesis/apteryx", NULL);
xmlSetNs (module, ns);
xmlNewNs (module, (const xmlChar *) "http://www.w3.org/2001/XMLSchema-instance", (const xmlChar *) "xsi");
xmlNewProp (module, (const xmlChar *) "xsi:schemaLocation",
(const xmlChar *) "https://github.com/alliedtelesis/apteryx-xml https://github.com/alliedtelesis/apteryx-xml/releases/download/v1.2/apteryx.xsd");
xmlDocSetRootElement (instance->doc, module);
if (model_list_filename)
sch_load_model_list (instance, path, model_list_filename);
load_schema_files (&files, path);
for (iter = files; iter; iter = g_list_next (iter))
{
sch_load_item *item;
char *filename;
char *ext;
item = iter->data;
filename = item->filename;
ext = strrchr(filename, '.');
if (g_strcmp0 (ext, ".map") == 0)
{
sch_load_namespace_mappings (instance, filename);
continue;
}
xmlNode *module_new = xmlDocGetRootElement (item->doc_new);
cleanup_nodes (module_new);
/* Sanity check for empty modules */
if (!module_new || (module_new->children && (module_new->children->name[0] != 'N' && module_new->children->name[0] != 'S')))
{
syslog (LOG_ERR, "XML: ignoring empty schema \"%s\"", filename);
continue;
}
copy_nsdef_to_root (instance->doc, module_new);
if (save_module_info (instance, module_new))
{
add_module_info_to_child (instance, module_new);
merge_nodes (module_new->ns, module, module->children, module_new->children, 0);
xmlFreeDoc (item->doc_new);
item->doc_new = NULL;
assign_ns_to_root (instance->doc, module->children);
}
else
{
xmlFreeDoc (item->doc_new);
item->doc_new = NULL;
}
}
g_list_free_full (files, sch_load_item_free);
/* Store a link back to the instance in the xmlDoc stucture */
instance->doc->_private = (void *) instance;
return instance;
}
sch_instance *
sch_load (const char *path)
{
return _sch_load (path, NULL);
}
/**
* Only load XML models that are specified in the model list file. If the model list
* filename is NULL, all models are loaded.
*/
sch_instance *
sch_load_with_model_list_filename (const char *path, const char *model_list_filename)
{
return _sch_load (path, model_list_filename);
}
static void
sch_free_loaded_models (GList *loaded_models)
{
GList *list;
sch_loaded_model *loaded;
if (loaded_models)
{
for (list = g_list_first (loaded_models); list; list = g_list_next (list))
{
loaded = list->data;
if (loaded->ns_href)
{
g_free (loaded->ns_href);
}
if (loaded->model)
{
g_free (loaded->model);
}
if (loaded->organization)
{
g_free (loaded->organization);
}
if (loaded->ns_prefix)
{
g_free (loaded->ns_prefix);
}
if (loaded->version)
{
g_free (loaded->version);
}
if (loaded->features)
{
g_free (loaded->features);
}
if (loaded->deviations)
{
g_free (loaded->deviations);
}
g_free (loaded);
}
g_list_free (loaded_models);
loaded_models = NULL;
}
}
static void
free_regex (regex_t *regex_obj)
{
regfree (regex_obj);
g_free (regex_obj);
}
void
sch_free (sch_instance * instance)
{
if (instance)
{
if (instance->models_list)
sch_free_loaded_models (instance->models_list);
if (instance->doc)
xmlFreeDoc (instance->doc);
if (instance->map_hash_table)
g_hash_table_destroy (instance->map_hash_table);
if (instance->model_hash_table)
g_hash_table_destroy (instance->model_hash_table);
if (instance->regexes)
g_list_free_full (instance->regexes, (GDestroyNotify) free_regex);
g_free (instance);
}
}
GList *
sch_get_loaded_models (sch_instance * instance)
{
return instance->models_list;
}
gboolean
sch_match_name (const char *s1, const char *s2)
{
char c1, c2;
do
{
c1 = *s1;
c2 = *s2;
if (c1 == '\0' && c2 == '\0')
return true;
if (c1 == '-')
c1 = '_';
if (c2 == '-')
c2 = '_';
s1++;
s2++;
}
while (c1 == c2);
return false;
}
static bool
_sch_ns_native (sch_instance *instance, xmlNs *ns)
{
/* No namespace means native */
if (!ns)
return true;
/* Root namespace is considered native */
if (instance && ns == xmlDocGetRootElement (instance->doc)->ns)
return true;
/* Check if namespace is in the table of non-native namespaces */
if (instance && instance->map_hash_table)
{
if (g_hash_table_lookup (instance->map_hash_table, (const char *) ns->href))
return false;
}
return true;
}
bool
sch_ns_native (sch_instance *instance, sch_ns *ns)
{
return _sch_ns_native (instance, (xmlNs *)ns);
}
static bool
remove_hidden_children (xmlNode *node)
{
xmlNode *child;
if (node == NULL)
return false;
/* Keep all the value nodes */
if (node->name[0] == 'V')
return true;
/* Throw away any non schema nodes */
if (node->name[0] != 'M' && node->name[0] != 'N')
return false;
if (sch_is_hidden (node))
return false;
child = node->children;
while (child)
{
if (!remove_hidden_children (child))
{
xmlNode *dchild = child;