How do match/compare nodes?

Hi

I am a bit confused how to tackle my problem and hope someone will be able
to give me a few pointers how to get started at least.

I want to read in the xml file which contains two maps and if a particular
node matches then I want to print out both maps in one line with elements
separated by a pipe (|) symbol, if they don't match then I will ignore the
result.

The node I want to match is "map/assignment/marker/name" 


The is the relevant part of my xml code:

        <map id="0">
                <name>Setaria-Wild-I</name>
                <species>Setaria italica</species>
                <lower_extent>21.7</lower_extent>
                <upper_extent>151.5</upper_extent>
                <assignment>
                        <marker>
                                <name>Xrgc285</name>
                                <homology_group>C285</homology_group>
                        </marker>
                        <position>38</position>
                </assignment>
        </map>
        <map id="1">
                <name>Pennisetum-Lx1-7</name>
                <species>Pennisetum glaucum</species>
                <lower_extent>50</lower_extent>
                <upper_extent>151.5</upper_extent>
                <assignment>
                        <marker>
                                <name>Xrgc285</name>
                                <homology_group>C285</homology_group>
                        </marker>
                        <position>24</position>
                </assignment>
        </map>




Many thanks in advance,
Virginia



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