How I can change value in XML file ?

toren has asked for the wisdom of the Perl Monks concerning the following question:

I'm a newbie to work with XML.

I'd like to change value from <Item Value="NONE"/> to <Item Value="API"/> under <Parameter Name="MapSource">

My XML file looks like this:

<Configuration>

    <Parameters>

        <Component Name="MY">

            <Group Name="PrivilegesMapping">

<Parameter Name="PrivilegesLoaderInterval">

<Description> The interval (in minute) </Description>
                    <Type>Integer</Type>
                    <Restriction>
                        <RequiresRestart>true</RequiresRestart>
                        <MinVal/>
                        <MaxVal/>
                        <MaxLength/>
                        <Mandatory>true</Mandatory>
                        <Lov/>
                        <Level>5</Level>
                    </Restriction>
                    <Value>
                        <Item Value="5"/>
                    </Value>
                </Parameter>
            </Group>
            <Group Name="DomainsMapping">
                <Parameter Name="DomainLoaderInterval">
                    <Description>
                    The interval (in minute) 
                    </Description>
                    <Type>Integer</Type>
                    <Restriction>
                        <RequiresRestart>true</RequiresRestart>
                        <MinVal/>
                        <MaxVal/>
                        <MaxLength/>
                        <Mandatory>true</Mandatory>
                        <Lov/>
                        <Level>5</Level>
                    </Restriction>
                    <Value>
                        <Item Value="5"/>
                    </Value>
                </Parameter>
                <Parameter Name="MapSource">
                    <Description>
                    Set the source of the domains list
                    </Description>
                    <Type>Enum</Type>
                    <Restriction>
                        <RequiresRestart>true</RequiresRestart>
                        <MinVal/>
                        <MaxVal/>
                        <MaxLength/>
                        <Mandatory>true</Mandatory>
                        <Lov>
                            <Val>FILE</Val>
                            <Val>DATABASE</Val>
                            <Val>NONE</Val>
                        </Lov>
                        <Level>5</Level>
                    </Restriction>
                    <Value>
                        <Item Value="FILE"/>
                    </Value>
                </Parameter>
            </Group>
            <Group Name="SystemsMapping">
                <Parameter Name="MapSource">
                    <Description>
                    </Description>
                    <Type>Enum</Type>
                    <Restriction>
                        <RequiresRestart>true</RequiresRestart>
                        <MinVal/>
                        <MaxVal/>
                        <MaxLength/>
                        <Mandatory>true</Mandatory>
                        <Lov>
                            <Val>API</Val>
                            <Val>FILE</Val>
                            <val>NONE</Val>
                        </Lov>
                        <Level>5</Level>
                    </Restriction>
                    <Value>
[download]

<Item Value="NONE"/>

</Value>
                </Parameter>
                <Parameter Name="SystemsLoaderInterval">
                    <Description>
                    The interval (in minute) 
                    </Description>
                    <Type>Integer</Type>
                    <Restriction>
                        <RequiresRestart>true</RequiresRestart>
                        <MinVal/>
                        <MaxVal/>
                        <MaxLength/>
                        <Mandatory>true</Mandatory>
                        <Lov/>
                        <Level>5</Level>
                    </Restriction>
                    <Value>
                        <Item Value="5"/>
                    </Value>
                </Parameter>
            </Group>
        </Component>
    </Parameters>
</Configuration>
[download]

Comment on How I can change value in XML file ? Select or Download Code

Replies are listed 'Best First'.
Re: How I can change value in XML file ? by ikegami (Patriarch) on Aug 04, 2010 at 18:05 UTC
Using XML::LibXML, `use strict; use warnings; use XML::LibXML qw( ); my $file_name = '...'; my $parser = XML::LibXML->new(); my $doc = $parser->parse_file(...); my $root = $doc->documentElement(); for my $node ($root->findnodes( '//Parameter[@Name="MapSource"]' .'/Value/Item[@Value="NONE"]' )) { $node->setAttribute(Value => 'API'); } open(my $fh, '>:bytes', $file_name) or die; print($fh $doc->toString());` [download] Update: Forgot to select correct Parameter. Fixed.	[reply] [d/l]
Re: How I can change value in XML file ? by toolic (Bishop) on Aug 04, 2010 at 16:48 UTC
I recommend using XML::Twig. After you work through its tutorial, post the code you have tried if you can not solve your problem.	[reply]
Re^2: How I can change value in XML file ? by toren (Novice) on Aug 05, 2010 at 10:59 UTC
http://xmltwig.com/ is down . It's a little bit difficult to implement CPAN specs as newbie in XML::Twig .If you have good online tutorials please replay.Thx.	[reply]
Re^3: How I can change value in XML file ? (XML::Twig website problem) by toolic (Bishop) on Aug 05, 2010 at 13:38 UTC
http://xmltwig.com/ is down Interesting. I am able to access http://xmltwig.com using an old version of Firefox on Linux. But, I can not access it from either Firefox (recent version) or IE on Windows. If you have good online tutorials please replay. That is the only tutorial that I know about. Perhaps mirod can address his website issue.	[reply]
Re^4: How I can change value in XML file ? (XML::Twig website problem) by marto (Cardinal) on Aug 05, 2010 at 13:51 UTC
Re^4: How I can change value in XML file ? (XML::Twig website problem) by Anonymous Monk on Aug 05, 2010 at 14:07 UTC
Re^4: How I can change value in XML file ? (XML::Twig website problem) (OT) by proceng (Scribe) on Aug 05, 2010 at 21:20 UTC
Re: How I can change value in XML file ? by marto (Cardinal) on Aug 04, 2010 at 16:49 UTC
Use a module like XML::Twig, good documentation and many tutorials on the XML::Twig website. If you need help installing modules see Installing Modules from the tutorials section.	[reply]
Re: How I can change value in XML file ? by Your Mother (Archbishop) on Aug 04, 2010 at 18:56 UTC
FYC: XML::LibXML has sparser docs and fewer tutorials than the very capable XML::Twig but it is a widely used lib underneath and if you learn its API, you'll be learning things that can transfer to many other places.	[reply]
Re^2: How I can change value in XML file ? by graff (Chancellor) on Aug 05, 2010 at 02:42 UTC
Maybe I'm just "different", but in my own experience, the man pages that come with XML::LibXML are actually easier to use than the manual for XML::Twig. (Sometimes "less is more": another way of saying that the LibXML docs are "sparser" is that they are more concise). Apart from that, LibXML runs a lot faster, and tends to impose a much smaller memory footprint when it comes to handling a large XML structure.	[reply]
Re^3: How I can change value in XML file ? by Your Mother (Archbishop) on Aug 05, 2010 at 06:08 UTC
Yeah, in fact. Now I find the XML::LibXML docs quite nice but when I was starting with it way back when it was maddening. You need a decent understanding of the DOM and iterators and such to know which of the many docs to check. Once you do, they're great. Before that… uh… wha?	[reply]
Re^4: How I can change value in XML file ? by ikegami (Patriarch) on Aug 05, 2010 at 14:25 UTC
Re^3: How I can change value in XML file ? by Jenda (Abbot) on Aug 05, 2010 at 18:04 UTC
Yeah, if you misuse XML::Twig and force it to keep the whole file in memory. Jenda Enoch was right! Enjoy the last years of Rome.	[reply]
Re: How I can change value in XML file ? by choroba (Cardinal) on Aug 05, 2010 at 10:02 UTC
I often use XML::XSH2: `#!/usr/bin/perl use XML::XSH2; xsh << EOX open 852913.xml ; insert attribute 'Value="API"' into //Parameter[@Name="MapSource"]// +Item[@Value="NONE"] ; save :b ; EOX` [download]	[reply] [d/l]