I did not check the logs from any directories. GUI just rejected it with simple words.

I tried to install it from command line. I found some errors from there: There were only some dependency problems. Those were easily solved.
Then libxml-parser-perl and libxml-perl got installed. So, I am happy regarding that now.

The commands which were executed now:

# dpkg -i libxml-parser-perl_2.34-4osso1_armel.deb
Selecting previously deselected package libxml-parser-perl.
(Reading database ... 32667 files and directories currently installed.)
Unpacking libxml-parser-perl (from libxml-parser-perl_2.34-4osso1_armel.deb) ...
dpkg: dependency problems prevent configuration of libxml-parser-perl:
libxml-parser-perl depends on liburi-perl; however:
Package liburi-perl is not installed.
libxml-parser-perl depends on libwww-perl; however:
Package libwww-perl is not installed.
dpkg: error processing libxml-parser-perl (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
libxml-parser-perl



# apt-get install liburi-perl libwww-perl
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
libwww-perl: Depends: libhtml-parser-perl (>= 3.56) but it is not going to be installed
Depends: libhtml-tree-perl (>= 3.23) but it is not going to be installed
Depends: libhtml-tagset-perl (>= 3.20) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).


# apt-get install liburi-perl libwww-perl libhtml-parser-perl libhtml-tree-perl libhtml-tagset-perl
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
libio-socket-ssl-perl
Recommended packages:
libmailtools-perl libhtml-format-perl libcompress-zlib-perl
The following NEW packages will be installed:
libhtml-parser-perl libhtml-tagset-perl libhtml-tree-perl liburi-perl libwww-perl
0 upgraded, 5 newly installed, 0 to remove and 24 not upgraded.
1 not fully installed or removed.
Need to get 787kB of archives.
After this operation, 2331kB of additional disk space will be used.
Get:1 http://repository.maemo.org fremantle-1.3/free liburi-perl 1.35.dfsg.1-1maemo2 [86,4kB]
Get:2 http://repository.maemo.org fremantle-1.3/free libhtml-tagset-perl 3.20-2maemo2 [13,7kB]
Get:3 http://repository.maemo.org fremantle-1.3/free libhtml-parser-perl 3.56-11maemo6 [107kB]
Get:4 http://repository.maemo.org fremantle-1.3/free libhtml-tree-perl 3.23-1maemo5.1 [209kB]
Get:5 http://repository.maemo.org fremantle-1.3/free libwww-perl 5.813-1maemo3 [371kB]
Fetched 787kB in 1s (494kB/s)
Selecting previously deselected package liburi-perl.
(Reading database ... 32724 files and directories currently installed.)
Unpacking liburi-perl (from .../liburi-perl_1.35.dfsg.1-1maemo2_all.deb) ...
Selecting previously deselected package libhtml-tagset-perl.
Unpacking libhtml-tagset-perl (from .../libhtml-tagset-perl_3.20-2maemo2_all.deb) ...
Selecting previously deselected package libhtml-parser-perl.
Unpacking libhtml-parser-perl (from .../libhtml-parser-perl_3.56-11maemo6_armel.deb) ...
Selecting previously deselected package libhtml-tree-perl.
Unpacking libhtml-tree-perl (from .../libhtml-tree-perl_3.23-1maemo5.1_all.deb) ...
Selecting previously deselected package libwww-perl.
Unpacking libwww-perl (from .../libwww-perl_5.813-1maemo3_all.deb) ...
Setting up liburi-perl (1.35.dfsg.1-1maemo2) ...
Setting up libhtml-tagset-perl (3.20-2maemo2) ...
Setting up libhtml-parser-perl (3.56-11maemo6) ...
Setting up libhtml-tree-perl (3.23-1maemo5.1) ...
Setting up libwww-perl (5.813-1maemo3) ...
Setting up libxml-parser-perl (2.34-4osso1) ...


# dpkg -i libxml-parser-perl_2.34-4osso1_armel.deb
(Reading database ... 32979 files and directories currently installed.)
Preparing to replace libxml-parser-perl 2.34-4osso1 (using libxml-parser-perl_2.34-4osso1_armel.deb) ...
Unpacking replacement libxml-parser-perl ...
Setting up libxml-parser-perl (2.34-4osso1) ...


# apt-get install libxml-perl
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
libxml-perl
... 1 newly installed, 0 to remove and 24 not upgraded.
Need to get 117kB of archives.
After this operation, 426kB of additional disk space will be used.
Get:1 http://repository.maemo.org fremantle-1.3/free libxml-perl 0.08-1maemo1 [117kB]
Fetched 117kB in 0s (248kB/s)
Selecting previously deselected package libxml-perl.
(Reading database ... 32979 files and directories currently installed.)
Unpacking libxml-perl (from .../libxml-perl_0.08-1maemo1_all.deb) ...
Setting up libxml-perl (0.08-1maemo1) ...

I will later check what it will bring. I would like to execute xslts too, in perl.