<?xml version="1.0" encoding="UTF-8"?>
<book>
    <chapter id="1">
        <page id="1">
            <para id="1" type="text"> 1 First para <label id="1">1 First label</label>
            </para>
            <para id="2" type="text"> 1 Second para <table>
                    <para id="3" type="tabletext">1 Table para</para>
                </table>
            </para>
        </page>
    </chapter>
    <chapter id="2">
        <page id="1">
            <para id="4" type="text"> 2 First para </para>
            <para id="5" type="text"> 2 Second para <table id="table">
                    <tr>
                        <td>
                            <para id="6" type="tabletext">2 Table para </para>
                            <label id="2">2 Second label</label>
                        </td>
                    </tr>
                </table>
            </para>
        </page>
    </chapter>
</book>

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="text"/>
    <xsl:template match="book">
        <xsl:apply-templates select="chapter//para"/>
    </xsl:template>
    <xsl:template match="label"/>
    <xsl:template match="para"/>
    <xsl:template match="para[@type='tabletext']"> ID <xsl:value-of select="@id"/>:&#160;<xsl:value-of select="."/>
        <xsl:text>&#x0a;</xsl:text>
    </xsl:template>
</xsl:stylesheet>

 ID 3: 1 Table para
 ID 6: 2 Table para

#!/usr/bin/perl
use XML::LibXML; 
use XML::LibXSLT;
my $parser=XML::LibXML->new();
my $xslt=XML::LibXSLT->new();
my $stylesheet=$xslt->parse_stylesheet_file('test.xsl');
my $doc=$parser->parse_file('test.xml');
print $stylesheet->output_string($doc);

1 First para 1 First label
             1 Second para 
                    1 Table para
             2 First para 
             2 Second para 
                            2 Table para 
                            2 Second label

#!/usr/bin/perl
use XML::LibXML; 
use XML::LibXSLT;
my $parser=XML::LibXML->new();
my $xslt=XML::LibXSLT->new();
my $stylesheet=$xslt->parse_stylesheet_file('test.xsl');
my $doc=$parser->parse_file('test.xml');
my $transformed_document=$stylesheet->transform($doc); <-------------------- ПРИМЕНИТЬ ШАБЛОНЫ!!!
print $stylesheet->output_string($transformed_document);