edit xml config files whith cfengine

[Uli Knauss]

Hello,

I have to check and edit many xml-Files with cfengine. 
The xml-Files looks like this example:

<< -- snipp -- >>
<datasources>
        <data>
             <id>foot01</id>
                <files>
                        <filename1>foo-file01</filename1>
                        <filename2>foo-file02</filename2>
                </files>
        </data>
        <datasource>
             <id>foo01</id>
                <database>
                        <user>foo-user01</user>
                        <pwd>foo-password01</pwd>
                        <use>true</use>
                        <connections>
                                <waittime>2000</waittime>
                        </connections>
                </database>
             <id>foo02</id>
                <database>
                        <user>foo-user02</user>
                        <pwd>foo-password02</pwd>
                        <use>true</use>
                        <connections>
                                <waittime>2000</waittime>
                        </connections>
                </database>
        </datasource>
</datasources>
<< -- snapp -- >>

For example: I have to change/check the value "<use>  </use>" to
"false" but only in datasource "<id>foo01</id>", not in
"<id>foo02</id>" or on other places in the file.

My solution for now is first to search for "<datasource>". After this
I search for "<id>foo01</id>" and then I look for "<use>...</use>" and
change the line regardless if the line is correct or not. This looks
in the cfengine program like this:

<< -- snipp -- >>
editfiles:

       { /tmp/foo.xml
         LocateLineMatching '.*<datasource>'
         LocateLineMatching '.*<id>foo01<\/id>'
         LocateLineMatching '.*<use>.*<\/use>'
         ReplaceLineWith '<use>false</use>'
       }
<< -- snapp -- >>

May be somebody have a better idea or a shorter solution to edit
xml-files. Is there a facilty to edit XML-Files in a proper way?

Thanks for any hints
Uli