How libxml2 can preserve spaces?

Wiktionary xml need space preserving, small example xml:

<mediawiki xmlns="http://www.mediawiki.org/xml/export-0.10/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.mediawiki.org/xml/export-0.10/
http://www.mediawiki.org/xml/export-0.10.xsd" version="0.10"
xml:lang="iu">
  <page>
    <title>Template:All messages</title>
    <ns>10</ns>
    <id>570</id>
    <revision>
      <id>2754</id>
      <text bytes="127367" xml:space="preserve">This is a list of all
messages available in the MediaWiki: namespace
&lt;table border=1 width=100%&gt;&lt;tr&gt;&lt;td&gt;
  '''Name'''
&lt;/td&gt;&lt;td&gt;
        </text>
    </revision>
  </page>
</mediawiki>

I am using libxml2 with wrapper libxml++ and use example from
https://github.com/libxmlplusplus/libxmlplusplus/tree/libxml++-3-2/examples/sax_parser

In method MySaxParser::on_characters I give new line characters after
chars < and >

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