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Tk::XMLViewer - Tk widget to display XML


  use Tk::XMLViewer;
  $xmlviewer = $top->XMLViewer->pack;
  $xmlviewer->insertXML(-file => "test.xml");
  $xmlviewer->insertXML(-text => '<?xml version="1.0" encoding="ISO-8859-1" ?><a><bla /><foo>bar</foo></a>');


Tk::XMLViewer is an widget inherited from Tk::Text which displays XML in a hierarchical tree. You can use the plus and minus buttons to hide/show parts of the tree.


Tk::XMLViewer supports all option of Tk::Text and additionally the following:

-tagcolor => $color

Foreground color of tags.

-attrkeycolor => $color

Foreground color of attribute keys.

-attrvalcolor => $color

Foreground color of attribute values.

-commentcolor => $color

Foreground color of comment sections.

The text tags xml_tag, xml_attrkey, xml_attrval, and xml_comment are defined for the corresponding XML elements. If you want to customize further you can configure the tags directly, for example:

    $xmlviewer->tagConfigure('xml_comment', -foreground => "white",
                             -background => "red", -font => "Helvetica 6");



Insert XML into the XMLViewer widget. Use the -file argument to insert a file and -text to insert an XML string. A hash to the -xmlparserargs option will be passed to the XML::Parser constructor.


Dump the contents of an Tk::Text widget into an XML string. This is meant as a alternative to the Tk::Text::dump method (in fact, DumpXML is implemented with the help of dump).

The output of DumpXML can be used as input for the XMLViewer widget, which is useful in debugging Tk::Text tags.

Use the static variant of DumpXML for Tk::Text widgets and the method variant for XMLViewer widgets.

    $xml_string1 = Tk::XMLViewer::DumpXML($text_widget);

    $xml_string2 = $xmlviewer->DumpXML;

Set indent with for XML tags


Insert XML Menu into Text widget menu.


Returns type of source used for last insertXML (-file or -text)


Returns filename (source type -file) or XML text (source type -text) used for last insertXML.


Returns hash of standard XML decl and DOCTYPE elements:

    my %xmlheader = $xmlviewer->GetInfo;

Elements for XMLdecl: Version Encoding Standalone Elements for DOCTYPE: Name Sysid Pubid Internal



Perl/Tk 804 has Unicode support, so has Tk::XMLViewer.

Perl/Tk 800 does not support Unicode. In this case Tk::XMLViewer tries to translate all characters returned by the XML parser to the iso-8859-1 charset. This may be done with a builtin function like pack/unpack or a CPAN module like Unicode::String. If no fallback could be found, then Unicode characters show as binary values.


DumpXML will not work with nested text tags.

There should be only one insertXML operation at one time (these is probably only an issue with threaded operations, which do not work in Perl/Tk anyway).

Viewing of large XML files is slow.


 - show to depth n: close everything from depth n+1
 - create menu item "close selected region"
 - DTD validation (is this possible with XML::Parser?)
 - use alternative XML parser i.e. XML::LibXML::Reader (maybe this
   would be faster?)


Slaven Rezic, <>

Some additions by Jerry Geiger <>.


XML::Parser, Tk::Text, tkxmlview.