static VALUE attributes(VALUE self)
{
  xmlDtdPtr dtd;
  VALUE hash;

  Data_Get_Struct(self, xmlDtd, dtd);

  hash = rb_hash_new();

  if(!dtd->attributes) return hash;

  xmlHashScan((xmlHashTablePtr)dtd->attributes, element_copier, (void *)hash);

  return hash;
}

# File lib/nokogiri/xml/dtd.rb, line 15
def each
  attributes.each do |key, value|
    yield([key, value])
  end
end

static VALUE elements(VALUE self)
{
  xmlDtdPtr dtd;
  VALUE hash;

  Data_Get_Struct(self, xmlDtd, dtd);

  if(!dtd->elements) return Qnil;

  hash = rb_hash_new();

  xmlHashScan((xmlHashTablePtr)dtd->elements, element_copier, (void *)hash);

  return hash;
}

static VALUE entities(VALUE self)
{
  xmlDtdPtr dtd;
  VALUE hash;

  Data_Get_Struct(self, xmlDtd, dtd);

  if(!dtd->entities) return Qnil;

  hash = rb_hash_new();

  xmlHashScan((xmlHashTablePtr)dtd->entities, element_copier, (void *)hash);

  return hash;
}

static VALUE external_id(VALUE self)
{
  xmlDtdPtr dtd;
  Data_Get_Struct(self, xmlDtd, dtd);

  if(!dtd->ExternalID) return Qnil;

  return NOKOGIRI_STR_NEW2(dtd->ExternalID);
}

# File lib/nokogiri/xml/dtd.rb, line 25
def html5_dtd?
  html_dtd? &&
    external_id.nil? &&
    (system_id.nil? || system_id == 'about:legacy-compat')
end

# File lib/nokogiri/xml/dtd.rb, line 21
def html_dtd?
  name.casecmp('html').zero?
end

# File lib/nokogiri/xml/dtd.rb, line 11
def keys
  attributes.keys
end

static VALUE notations(VALUE self)
{
  xmlDtdPtr dtd;
  VALUE hash;

  Data_Get_Struct(self, xmlDtd, dtd);

  if(!dtd->notations) return Qnil;

  hash = rb_hash_new();

  xmlHashScan((xmlHashTablePtr)dtd->notations, notation_copier, (void *)hash);

  return hash;
}

static VALUE system_id(VALUE self)
{
  xmlDtdPtr dtd;
  Data_Get_Struct(self, xmlDtd, dtd);

  if(!dtd->SystemID) return Qnil;

  return NOKOGIRI_STR_NEW2(dtd->SystemID);
}

static VALUE validate(VALUE self, VALUE document)
{
  xmlDocPtr doc;
  xmlDtdPtr dtd;
  xmlValidCtxtPtr ctxt;
  VALUE error_list;

  Data_Get_Struct(self, xmlDtd, dtd);
  Data_Get_Struct(document, xmlDoc, doc);
  error_list = rb_ary_new();

  ctxt = xmlNewValidCtxt();

  xmlSetStructuredErrorFunc((void *)error_list, Nokogiri_error_array_pusher);

  xmlValidateDtd(ctxt, doc, dtd);

  xmlSetStructuredErrorFunc(NULL, NULL);

  xmlFreeValidCtxt(ctxt);

  return error_list;
}