Navigating XML Using Attributes

I have an XML document that was dumped from a database.  Instead of the 
elements being nested in an appropriate, well-formed XML fashion, they are 
associated with ID attributes.  The following XML is a generalized sample with 
Account being the root element:

<?xml version="1.0" encoding="UTF-8"?>
<Account>
        <LevelA1>
                <LevelA2>
                        <LevelA3 Id="111"/>
                        <LevelA3 Id="222"/>
                        <LevelA3 Id="333"/>
                </LevelA2>
        </LevelA1>
        <LevelA3 Id="111">
                <LevelB1>
                        <LevelB2 Id="1"/>
                        <LevelB2 Id="2"/>
                        <LevelB2 Id="3"/>
                        <LevelB2 Id="4"/>
                </LevelB1>
        </LevelA3>
        <LevelB2 Id="1">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelB2 Id="2">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelB2 Id="3">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelB2 Id="4">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelA3 Id="222">
                <LevelB1>
                        <LevelB2 Id="5"/>
                        <LevelB2 Id="6"/>
                        <LevelB2 Id="7"/>
                        <LevelB2 Id="8"/>
                </LevelB1>
        </LevelA3>
        <LevelB2 Id="5">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelB2 Id="6">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelB2 Id="7">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelB2 Id="8">
                <LevelC1>data</LevelC1>
        </LevelB2>
        <LevelA3 Id="333">
                <LevelB1>
                        <LevelB2 Id="9"/>
                        <LevelB2 Id="10"/>
                        <LevelB2 Id="11"/>
                        <LevelB2 Id="12"/>
                </LevelB1>
        </LevelA3>
        <LevelB2 Id="9">
                <LevelC1>DataAlpha</LevelC1>
        </LevelB2>
        <LevelB2 Id="10">
                <LevelC1>DataBeta</LevelC1>
        </LevelB2>
        <LevelB2 Id="11">
                <LevelC1>DataGamma</LevelC1>
        </LevelB2>
        <LevelB2 Id="12">
                <LevelC1>DataDelta</LevelC1>
        </LevelB2>
</Account>

To navigate the XML document, one must pull the Ids from element <LevelA3> and 
return to the <Account> level to find the <LevelA3> elements that reside in the 
document just below <Account>.  Once the appropriate <LevelA3> element is 
found, the XSL must find its way to <LevelB2>, grab its Id, return to the top 
and find <LevelB2> below.  This continues until the data contained in <LevelC1> 
is found.  For example, the path to DataGamma is:
Account/LevelA1/LevelA2/LevelA3 Id="333"/LevelB1/LevelB2 
Id="11"/LevelC1:DataGamma

I assume I will have to use apply-templates again and again.  What I don't know 
is how to remember all the Ids in LevelA3, and below, so I can find each of the 
cooresponding elements.  Any suggestions?

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