Class: Nokogiri::XML::Document

Inherits:
Node
  • Object
show all
Defined in:
lib/nokogiri/xml/document.rb,
ext/nokogiri/xml_document.c,
ext/nokogiri/html_document.c

Overview

Nokogiri::XML::Document is the main entry point for dealing with XML documents. The Document is created by parsing an XML document. See Nokogiri::XML::Document.parse() for more information on parsing.

For searching a Document, see Nokogiri::XML::Searchable#css and Nokogiri::XML::Searchable#xpath

Direct Known Subclasses

HTML::Document

Constant Summary collapse

NCNAME_START_CHAR =

I’m ignoring unicode characters here. See www.w3.org/TR/REC-xml-names/#ns-decl for more details.

"A-Za-z_"
NCNAME_CHAR = 
NCNAME_START_CHAR + "\\-.0-9"
NCNAME_RE = 
/^xmlns(:[#{NCNAME_START_CHAR}][#{NCNAME_CHAR}]*)?$/

Constants inherited from Node

Node::ATTRIBUTE_DECL, Node::ATTRIBUTE_NODE, Node::CDATA_SECTION_NODE, Node::COMMENT_NODE, Node::DOCB_DOCUMENT_NODE, Node::DOCUMENT_FRAG_NODE, Node::DOCUMENT_NODE, Node::DOCUMENT_TYPE_NODE, Node::DTD_NODE, Node::ELEMENT_DECL, Node::ELEMENT_NODE, Node::ENTITY_DECL, Node::ENTITY_NODE, Node::ENTITY_REF_NODE, Node::HTML_DOCUMENT_NODE, Node::NAMESPACE_DECL, Node::NOTATION_NODE, Node::PI_NODE, Node::TEXT_NODE, Node::XINCLUDE_END, Node::XINCLUDE_START

Constants included from Searchable

Searchable::LOOKS_LIKE_XPATH

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Node

#<=>, #==, #>, #[], #[]=, #accept, #add_namespace_definition, #add_next_sibling, #add_previous_sibling, #after, #ancestors, #attribute, #attribute_nodes, #attribute_with_ns, #attributes, #before, #blank?, #cdata?, #child, #children, #children=, #comment?, #content, #content=, #create_external_subset, #create_internal_subset, #css_path, #decorate!, #default_namespace=, #description, #do_xinclude, #document?, #each, #element?, #element_children, #encode_special_chars, #external_subset, #first_element_child, #fragment?, #html?, #inner_html, #inner_html=, #internal_subset, #key?, #keys, #lang, #lang=, #last_element_child, #line, #matches?, #namespace, #namespace=, #namespace_definitions, #namespace_scopes, #namespaced_key?, #native_content=, #next_element, #next_sibling, #node_name, #node_name=, #node_type, #parent, #parent=, #parse, #path, #pointer_id, #prepend_child, #previous_element, #previous_sibling, #processing_instruction?, #read_only?, #remove_attribute, #replace, #serialize, #swap, #text?, #to_html, #to_s, #to_xhtml, #traverse, #unlink, #values, #write_html_to, #write_to, #write_xhtml_to, #write_xml_to, #xml?

Methods included from Searchable

#at, #at_css, #at_xpath, #css, #search, #xpath

Methods included from PP::Node

#inspect, #pretty_print

Constructor Details

#initialize(*args) ⇒ Document

:nodoc:



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# File 'lib/nokogiri/xml/document.rb', line 73

def initialize *args # :nodoc:
  @errors     = []
  @decorators = nil
end

Instance Attribute Details

#errors ⇒ Object

A list of Nokogiri::XML::SyntaxError found when parsing a document



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# File 'lib/nokogiri/xml/document.rb', line 71

def errors
  @errors
end

Class Method Details

.new(version = default) ⇒ Object

Create a new document with version (defaults to “1.0”)



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# File 'ext/nokogiri/xml_document.c', line 349

static VALUE new(int argc, VALUE *argv, VALUE klass)
{
  xmlDocPtr doc;
  VALUE version, rest, rb_doc ;

  rb_scan_args(argc, argv, "0*", &rest);
  version = rb_ary_entry(rest, (long)0);
  if (NIL_P(version)) version = rb_str_new2("1.0");

  doc = xmlNewDoc((xmlChar *)StringValueCStr(version));
  rb_doc = Nokogiri_wrap_xml_document(klass, doc);
  rb_obj_call_init(rb_doc, argc, argv);
  return rb_doc ;
}

.parse(string_or_io, url = nil, encoding = nil, options = ParseOptions::DEFAULT_XML) {|options| ... } ⇒ Object

Parse an XML file.

string_or_io may be a String, or any object that responds to read and close such as an IO, or StringIO.

url (optional) is the URI where this document is located.

encoding (optional) is the encoding that should be used when processing the document.

options (optional) is a configuration object that sets options during parsing, such as Nokogiri::XML::ParseOptions::RECOVER. See the Nokogiri::XML::ParseOptions for more information.

block (optional) is passed a configuration object on which parse options may be set.

When parsing untrusted documents, it’s recommended that the nonet option be used, as shown in this example code:

Nokogiri::XML::Document.parse(xml_string) { |config| config.nonet }

Nokogiri.XML() is a convenience method which will call this method.

Yields:

  • (options) 


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# File 'lib/nokogiri/xml/document.rb', line 43

def self.parse string_or_io, url = nil, encoding = nil, options = ParseOptions::DEFAULT_XML, &block
  options = Nokogiri::XML::ParseOptions.new(options) if Fixnum === options
  # Give the options to the user
  yield options if block_given?

  if empty_doc?(string_or_io)
    if options.strict?
      raise Nokogiri::XML::SyntaxError.new("Empty document")
    else
      return encoding ? new.tap { |i| i.encoding = encoding } : new
    end
  end

  doc = if string_or_io.respond_to?(:read)
    url ||= string_or_io.respond_to?(:path) ? string_or_io.path : nil
    read_io(string_or_io, url, encoding, options.to_i)
  else
    # read_memory pukes on empty docs
    read_memory(string_or_io, url, encoding, options.to_i)
  end

  # do xinclude processing
  doc.do_xinclude(options) if options.xinclude?

  return doc
end

.read_io(io, url, encoding, options) ⇒ Object

Create a new document from an IO object



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# File 'ext/nokogiri/xml_document.c', line 225

static VALUE read_io( VALUE klass,
                      VALUE io,
                      VALUE url,
                      VALUE encoding,
                      VALUE options )
{
  const char * c_url    = NIL_P(url)      ? NULL : StringValueCStr(url);
  const char * c_enc    = NIL_P(encoding) ? NULL : StringValueCStr(encoding);
  VALUE error_list      = rb_ary_new();
  VALUE document;
  xmlDocPtr doc;

  xmlResetLastError();
  xmlSetStructuredErrorFunc((void *)error_list, Nokogiri_error_array_pusher);

  doc = xmlReadIO(
      (xmlInputReadCallback)io_read_callback,
      (xmlInputCloseCallback)io_close_callback,
      (void *)io,
      c_url,
      c_enc,
      (int)NUM2INT(options)
  );
  xmlSetStructuredErrorFunc(NULL, NULL);

  if(doc == NULL) {
    xmlErrorPtr error;

    xmlFreeDoc(doc);

    error = xmlGetLastError();
    if(error)
      rb_exc_raise(Nokogiri_wrap_xml_syntax_error(error));
    else
      rb_raise(rb_eRuntimeError, "Could not parse document");

    return Qnil;
  }

  document = Nokogiri_wrap_xml_document(klass, doc);
  rb_iv_set(document, "@errors", error_list);
  return document;
}

.read_memory(string, url, encoding, options) ⇒ Object

Create a new document from a String



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# File 'ext/nokogiri/xml_document.c', line 275

static VALUE read_memory( VALUE klass,
                          VALUE string,
                          VALUE url,
                          VALUE encoding,
                          VALUE options )
{
  const char * c_buffer = StringValuePtr(string);
  const char * c_url    = NIL_P(url)      ? NULL : StringValueCStr(url);
  const char * c_enc    = NIL_P(encoding) ? NULL : StringValueCStr(encoding);
  int len               = (int)RSTRING_LEN(string);
  VALUE error_list      = rb_ary_new();
  VALUE document;
  xmlDocPtr doc;

  xmlResetLastError();
  xmlSetStructuredErrorFunc((void *)error_list, Nokogiri_error_array_pusher);
  doc = xmlReadMemory(c_buffer, len, c_url, c_enc, (int)NUM2INT(options));
  xmlSetStructuredErrorFunc(NULL, NULL);

  if(doc == NULL) {
    xmlErrorPtr error;

    xmlFreeDoc(doc);

    error = xmlGetLastError();
    if(error)
      rb_exc_raise(Nokogiri_wrap_xml_syntax_error(error));
    else
      rb_raise(rb_eRuntimeError, "Could not parse document");

    return Qnil;
  }

  document = Nokogiri_wrap_xml_document(klass, doc);
  rb_iv_set(document, "@errors", error_list);
  return document;
}

.wrap(document) ⇒ Object

JRuby Wraps Java’s org.w3c.dom.document and returns Nokogiri::XML::Document



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# File 'lib/nokogiri/xml/document.rb', line 256

def self.wrap document
  raise "JRuby only method" unless Nokogiri.jruby?
  return wrapJavaDocument(document)
end

Instance Method Details

#add_child(node_or_tags) ⇒ Object Also known as: << 



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# File 'lib/nokogiri/xml/document.rb', line 241

def add_child node_or_tags
  raise "Document already has a root node" if root && root.name != 'nokogiri_text_wrapper'
  node_or_tags = coerce(node_or_tags)
  if node_or_tags.is_a?(XML::NodeSet)
    raise "Document cannot have multiple root nodes" if node_or_tags.size > 1
    super(node_or_tags.first)
  else
    super
  end
end

#canonicalize(mode = XML_C14N_1_0, inclusive_namespaces = nil, with_comments = false) ⇒ Object #canonicalize {|obj, parent| ... } ⇒ Object

Canonicalize a document and return the results. Takes an optional block that takes two parameters: the obj and that node’s parent. The obj will be either a Nokogiri::XML::Node, or a Nokogiri::XML::Namespace The block must return a non-nil, non-false value if the obj passed in should be included in the canonicalized document.

Overloads:

  • #canonicalize {|obj, parent| ... } ⇒ Object

    Yields:



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# File 'ext/nokogiri/xml_document.c', line 492

static VALUE canonicalize(int argc, VALUE* argv, VALUE self)
{
  VALUE mode;
  VALUE incl_ns;
  VALUE with_comments;
  xmlChar **ns;
  long ns_len, i;

  xmlDocPtr doc;
  xmlOutputBufferPtr buf;
  xmlC14NIsVisibleCallback cb = NULL;
  void * ctx = NULL;

  VALUE rb_cStringIO;
  VALUE io;

  rb_scan_args(argc, argv, "03", &mode, &incl_ns, &with_comments);

  Data_Get_Struct(self, xmlDoc, doc);

  rb_cStringIO = rb_const_get_at(rb_cObject, rb_intern("StringIO"));
  io           = rb_class_new_instance(0, 0, rb_cStringIO);
  buf          = xmlAllocOutputBuffer(NULL);

  buf->writecallback = (xmlOutputWriteCallback)io_write_callback;
  buf->closecallback = (xmlOutputCloseCallback)io_close_callback;
  buf->context       = (void *)io;

  if(rb_block_given_p()) {
    cb = block_caller;
    ctx = (void *)rb_block_proc();
  }

  if(NIL_P(incl_ns)){
    ns = NULL;
  }
  else{
    Check_Type(incl_ns, T_ARRAY);
    ns_len = RARRAY_LEN(incl_ns);
    ns = calloc((size_t)ns_len+1, sizeof(xmlChar *));
    for (i = 0 ; i < ns_len ; i++) {
      VALUE entry = rb_ary_entry(incl_ns, i);
      const char * ptr = StringValueCStr(entry);
      ns[i] = (xmlChar*) ptr;
    }
  }


  xmlC14NExecute(doc, cb, ctx,
    (int)      (NIL_P(mode)        ? 0 : NUM2INT(mode)),
    ns,
    (int)      RTEST(with_comments),
    buf);

  xmlOutputBufferClose(buf);

  return rb_funcall(io, rb_intern("string"), 0);
}

#collect_namespaces ⇒ Object

Recursively get all namespaces from this node and its subtree and return them as a hash.

For example, given this document:

<root xmlns:foo="bar">
  <bar xmlns:hello="world" />
</root>

This method will return:

{ 'xmlns:foo' => 'bar', 'xmlns:hello' => 'world' }

WARNING: this method will clobber duplicate names in the keys. For example, given this document:

<root xmlns:foo="bar">
  <bar xmlns:foo="baz" />
</root>

The hash returned will look like this: { ‘xmlns:foo’ => ‘bar’ }

Non-prefixed default namespaces (as in “xmlns=”) are not included in the hash.

Note that this method does an xpath lookup for nodes with namespaces, and as a result the order may be dependent on the implementation of the underlying XML library.



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# File 'lib/nokogiri/xml/document.rb', line 166

def collect_namespaces
  xpath("//namespace::*").inject({}) do |hash, ns|
    hash[["xmlns",ns.prefix].compact.join(":")] = ns.href if ns.prefix != "xml"
    hash
  end
end

#create_cdata(string, &block) ⇒ Object

Create a CDATA Node containing string



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# File 'lib/nokogiri/xml/document.rb', line 117

def create_cdata string, &block
  Nokogiri::XML::CDATA.new self, string.to_s, &block
end

#create_comment(string, &block) ⇒ Object

Create a Comment Node containing string



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# File 'lib/nokogiri/xml/document.rb', line 122

def create_comment string, &block
  Nokogiri::XML::Comment.new self, string.to_s, &block
end

#create_element(name, *args, &block) ⇒ Object

Create an element with name, and optionally setting the content and attributes.

doc.create_element "div" # <div></div>
doc.create_element "div", :class => "container" # <div class='container'></div>
doc.create_element "div", "contents" # <div>contents</div>
doc.create_element "div", "contents", :class => "container" # <div class='container'>contents</div>
doc.create_element "div" { |node| node['class'] = "container" } # <div class='container'></div>



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# File 'lib/nokogiri/xml/document.rb', line 87

def create_element name, *args, &block
  elm = Nokogiri::XML::Element.new(name, self, &block)
  args.each do |arg|
    case arg
    when Hash
      arg.each { |k,v|
        key = k.to_s
        if key =~ NCNAME_RE
          ns_name = key.split(":", 2)[1]
          elm.add_namespace_definition ns_name, v
        else
          elm[k.to_s] = v.to_s
        end
      }
    else
      elm.content = arg
    end
  end
  if ns = elm.namespace_definitions.find { |n| n.prefix.nil? or n.prefix == '' }
    elm.namespace = ns
  end
  elm
end

#create_entity(name, type, external_id, system_id, content) ⇒ Object

Create a new entity named name.

type is an integer representing the type of entity to be created, and it defaults to Nokogiri::XML::EntityDecl::INTERNAL_GENERAL. See the constants on Nokogiri::XML::EntityDecl for more information.

external_id, system_id, and content set the External ID, System ID, and content respectively. All of these parameters are optional.



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# File 'ext/nokogiri/xml_document.c', line 421

static VALUE create_entity(int argc, VALUE *argv, VALUE self)
{
  VALUE name;
  VALUE type;
  VALUE external_id;
  VALUE system_id;
  VALUE content;
  xmlEntityPtr ptr;
  xmlDocPtr doc ;

  Data_Get_Struct(self, xmlDoc, doc);

  rb_scan_args(argc, argv, "14", &name, &type, &external_id, &system_id,
      &content);

  xmlResetLastError();
  ptr = xmlAddDocEntity(
      doc,
      (xmlChar *)(NIL_P(name)        ? NULL                        : StringValueCStr(name)),
      (int)      (NIL_P(type)        ? XML_INTERNAL_GENERAL_ENTITY : NUM2INT(type)),
      (xmlChar *)(NIL_P(external_id) ? NULL                        : StringValueCStr(external_id)),
      (xmlChar *)(NIL_P(system_id)   ? NULL                        : StringValueCStr(system_id)),
      (xmlChar *)(NIL_P(content)     ? NULL                        : StringValueCStr(content))
    );

  if(NULL == ptr) {
    xmlErrorPtr error = xmlGetLastError();
    if(error)
      rb_exc_raise(Nokogiri_wrap_xml_syntax_error(error));
    else
      rb_raise(rb_eRuntimeError, "Could not create entity");

    return Qnil;
  }

  return Nokogiri_wrap_xml_node(cNokogiriXmlEntityDecl, (xmlNodePtr)ptr);
}

#create_text_node(string, &block) ⇒ Object

Create a Text Node with string



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# File 'lib/nokogiri/xml/document.rb', line 112

def create_text_node string, &block
  Nokogiri::XML::Text.new string.to_s, self, &block
end

#decorate(node) ⇒ Object

Apply any decorators to node



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# File 'lib/nokogiri/xml/document.rb', line 214

def decorate node
  return unless @decorators
  @decorators.each { |klass,list|
    next unless node.is_a?(klass)
    list.each { |moodule| node.extend(moodule) }
  }
end

#decorators(key) ⇒ Object

Get the list of decorators given key



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# File 'lib/nokogiri/xml/document.rb', line 174

def decorators key
  @decorators ||= Hash.new
  @decorators[key] ||= []
end

#document ⇒ Object

A reference to self



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# File 'lib/nokogiri/xml/document.rb', line 132

def document
  self
end

#dup ⇒ Object Also known as: clone

Copy this Document. An optional depth may be passed in, but it defaults to a deep copy. 0 is a shallow copy, 1 is a deep copy.



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# File 'ext/nokogiri/xml_document.c', line 320

static VALUE duplicate_document(int argc, VALUE *argv, VALUE self)
{
  xmlDocPtr doc, dup;
  VALUE copy;
  VALUE level;
  VALUE error_list;

  if(rb_scan_args(argc, argv, "01", &level) == 0)
    level = INT2NUM((long)1);

  Data_Get_Struct(self, xmlDoc, doc);

  dup = xmlCopyDoc(doc, (int)NUM2INT(level));

  if(dup == NULL) return Qnil;

  dup->type = doc->type;
  copy = Nokogiri_wrap_xml_document(rb_obj_class(self), dup);
  error_list = rb_iv_get(self, "@errors");
  rb_iv_set(copy, "@errors", error_list);
  return copy ;
}

#encoding ⇒ Object

Get the encoding for this Document



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# File 'ext/nokogiri/xml_document.c', line 195

static VALUE encoding(VALUE self)
{
  xmlDocPtr doc;
  Data_Get_Struct(self, xmlDoc, doc);

  if(!doc->encoding) return Qnil;
  return NOKOGIRI_STR_NEW2(doc->encoding);
}

#encoding=(encoding) ⇒ Object

Set the encoding string for this Document



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# File 'ext/nokogiri/xml_document.c', line 176

static VALUE set_encoding(VALUE self, VALUE encoding)
{
  xmlDocPtr doc;
  Data_Get_Struct(self, xmlDoc, doc);

  if (doc->encoding)
      free((char *) doc->encoding); /* this may produce a gcc cast warning */

  doc->encoding = xmlStrdup((xmlChar *)StringValueCStr(encoding));

  return encoding;
}

#fragment(tags = nil) ⇒ Object

Create a Nokogiri::XML::DocumentFragment from tags Returns an empty fragment if tags is nil.



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# File 'lib/nokogiri/xml/document.rb', line 233

def fragment tags = nil
  DocumentFragment.new(self, tags, self.root)
end

#name ⇒ Object

The name of this document. Always returns “document”



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# File 'lib/nokogiri/xml/document.rb', line 127

def name
  'document'
end

#namespaces ⇒ Object

Get the hash of namespaces on the root Nokogiri::XML::Node



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# File 'lib/nokogiri/xml/document.rb', line 226

def namespaces
  root ? root.namespaces : {}
end

#remove_namespaces! ⇒ Object

Remove all namespaces from all nodes in the document.

This could be useful for developers who either don’t understand namespaces or don’t care about them.

The following example shows a use case, and you can decide for yourself whether this is a good thing or not:

doc = Nokogiri::XML <<-EOXML
   <root>
     <car xmlns:part="http://general-motors.com/">
       <part:tire>Michelin Model XGV</part:tire>
     </car>
     <bicycle xmlns:part="http://schwinn.com/">
       <part:tire>I'm a bicycle tire!</part:tire>
     </bicycle>
   </root>
   EOXML

doc.xpath("//tire").to_s # => ""
doc.xpath("//part:tire", "part" => "http://general-motors.com/").to_s # => "<part:tire>Michelin Model XGV</part:tire>"
doc.xpath("//part:tire", "part" => "http://schwinn.com/").to_s # => "<part:tire>I'm a bicycle tire!</part:tire>"

doc.remove_namespaces!

doc.xpath("//tire").to_s # => "<tire>Michelin Model XGV</tire><tire>I'm a bicycle tire!</tire>"
doc.xpath("//part:tire", "part" => "http://general-motors.com/").to_s # => ""
doc.xpath("//part:tire", "part" => "http://schwinn.com/").to_s # => ""

For more information on why this probably is not a good thing in general, please direct your browser to tenderlovemaking.com/2009/04/23/namespaces-in-xml.html



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# File 'ext/nokogiri/xml_document.c', line 401

VALUE remove_namespaces_bang(VALUE self)
{
  xmlDocPtr doc ;
  Data_Get_Struct(self, xmlDoc, doc);

  recursively_remove_namespaces_from_node((xmlNodePtr)doc);
  return self;
}

#root ⇒ Object

Get the root node for this document.



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# File 'ext/nokogiri/xml_document.c', line 157

static VALUE root(VALUE self)
{
  xmlDocPtr doc;
  xmlNodePtr root;

  Data_Get_Struct(self, xmlDoc, doc);

  root = xmlDocGetRootElement(doc);

  if(!root) return Qnil;
  return Nokogiri_wrap_xml_node(Qnil, root) ;
}

#root= ⇒ Object

Set the root element on this document



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# File 'ext/nokogiri/xml_document.c', line 113

static VALUE set_root(VALUE self, VALUE root)
{
  xmlDocPtr doc;
  xmlNodePtr new_root;
  xmlNodePtr old_root;

  Data_Get_Struct(self, xmlDoc, doc);

  old_root = NULL;

  if(NIL_P(root)) {
    old_root = xmlDocGetRootElement(doc);

    if(old_root) {
      xmlUnlinkNode(old_root);
      nokogiri_root_node(old_root);
    }

    return root;
  }

  Data_Get_Struct(root, xmlNode, new_root);


  /* If the new root's document is not the same as the current document,
   * then we need to dup the node in to this document. */
  if(new_root->doc != doc) {
    old_root = xmlDocGetRootElement(doc);
    if (!(new_root = xmlDocCopyNode(new_root, doc, 1))) {
      rb_raise(rb_eRuntimeError, "Could not reparent node (xmlDocCopyNode)");
    }
  }

  xmlDocSetRootElement(doc, new_root);
  if(old_root) nokogiri_root_node(old_root);
  return root;
}

#slop! ⇒ Object

Explore a document with shortcut methods. See Nokogiri::Slop for details.

Note that any nodes that have been instantiated before #slop! is called will not be decorated with sloppy behavior. So, if you’re in irb, the preferred idiom is:

irb> doc = Nokogiri::Slop my_markup

and not

irb> doc = Nokogiri::HTML my_markup
... followed by irb's implicit inspect (and therefore instantiation of every node) ...
irb> doc.slop!
... which does absolutely nothing.



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# File 'lib/nokogiri/xml/document.rb', line 203

def slop!
  unless decorators(XML::Node).include? Nokogiri::Decorators::Slop
    decorators(XML::Node) << Nokogiri::Decorators::Slop
    decorate!
  end

  self
end

#to_java ⇒ Object

JRuby Returns Java’s org.w3c.dom.document of this Document.



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# File 'lib/nokogiri/xml/document.rb', line 264

def to_java
  raise "JRuby only method" unless Nokogiri.jruby?
  return toJavaDocument()
end

#url ⇒ Object

Get the url name for this document.



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# File 'ext/nokogiri/xml_document.c', line 97

static VALUE url(VALUE self)
{
  xmlDocPtr doc;
  Data_Get_Struct(self, xmlDoc, doc);

  if(doc->URL) return NOKOGIRI_STR_NEW2(doc->URL);

  return Qnil;
}

#validate ⇒ Object

Validate this Document against it’s DTD. Returns a list of errors on the document or nil when there is no DTD.



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# File 'lib/nokogiri/xml/document.rb', line 182

def validate
  return nil unless internal_subset
  internal_subset.validate self
end

#version ⇒ Object

Get the XML version for this Document



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# File 'ext/nokogiri/xml_document.c', line 210

static VALUE version(VALUE self)
{
  xmlDocPtr doc;
  Data_Get_Struct(self, xmlDoc, doc);

  if(!doc->version) return Qnil;
  return NOKOGIRI_STR_NEW2(doc->version);
}