Alan Dickey


XML::DocStats - produce a simple analysis of an XML document


Analyze the xml document on STDIN, the STDOUT output format is html:

    use XML::DocStats;
    my $parse = XML::DocStats->new;

Analyze in-memory xml document:

    use XML::DocStats;
    my ($xmldata) = @_;
    my $parse = XML::DocStats->new(xmlsource=>{String => $xmldata},
                                           BYTES => length($xmldata));

Analyze xml document IO stream, the output format is plain text:

    use XML::DocStats;
    use IO::File;
    my $xmlsource = IO::File->new("< document.xml");
    my $parse = XML::DocStats->new(xmlsource=>{ByteStream => $xmlsource});


    XML::DocStats parses an xml document using a SAX handler built using Ken MacLeod's XML::Parser::PerlSAX. It produces a listing indented to show the element heirarchy, and collects counts of various xml components along the way. A summary of the counts is produced following the conclusion of the parse. This is useful to visualize the structure and content of an XML document.

    The output listing is either in plain text or html.

    Each xml thingy is color-coded in the html output for easy reading:

      • purple denotes elements.
      • blue denotes text (character data). The text itself is black.
      • olive denotes attributes and attribute valuesin elements, XML-DCL, DOCTYPE, and PIs.
      • fuchsia denotes entity references. The name of the entity is in black. fuchsia is also used to denote the root element, and to mark the start and finish of the parse, as well as to label the statistices at the end.
      • teal denotes the XML declaration.
      • navy denotes the DOCTYPE declaration.
      • maroon denotes PIs (processing instructions).
      • green denotes comments. The text of the comment is black.
      • red denotes error messages should the xml fail to be well-formed.



    Create a XML::DocStats. Parameters to control the input, output, and analysis format can be passed to new, to analyse, or by invoking parameter methods. See below.


    Parse the xml document and produce the analysis listing.

parameter methods

    Parameters to control the input, output, and analysis format can be passed to new, to analyse, or by invoking the parameter methods listed below, e.g. $parse->param('value'). When passing parameters to new or analyse, the form $parse->analyze(param=>'value') is used.

      xmlsource - values: the XML::Parser::PerlSAX Source, default: {ByteStream => \*STDIN}. See XML::Parser::PerlSAX.

      format - values: html/text, default: html. When format is html, the analysis listing is formatted in HTML; otherwise, plain text is produced.

      output - values: print/return, default: print. When outout is print, the analysis listing is printed to STDOUT incrementally as the parse progresses; otherwise, the listing is retured as a text string by analyze.

      print_htmlpage - values: yes/no, default: yes. When print_htmlpage is yes and format is html, the analysis listing is formatted as a complete XHTML document. Otherwise, if format is html, only the HTML tags necessary to format the listing are included.

      The following parameters control whether the corresponding xml thingy is included in the analysis listing. Setting all print_<item>s to no will produce just the summary statistics.

      print_element - values: yes/no, default: yes.

      print_text - values: yes/no, default: yes.

      print_entity - values: yes/no, default: yes.

      print_doctype - values: yes/no, default: yes.

      print_xmldcl - values: yes/no, default: yes.

      print_comment - values: yes/no, default: yes.

      print_pi - values: yes/no, default: yes.


An example command line script, is included in the eg directory of the distribution. After installation, you can put this script in your PATH and use it to analyze an xml document: mydoc.xml

or < mydoc.xml | less

My web site has an online example, see: "WEB SITE"


Alan Dickey <>


A working example of XML::DocStats can be found online at:


XML::Parser::PerlSAX, XML::Parser, Object::_Initializer.