How I can change value in XML file ?

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]

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