[xsl] Accessing every second node, extract and sort their elements and

Trying to convert to a XML document into another, I'm trying to figure out how 
to access every second element node from the document root, take and sort all 
their elements according 2 attributes ( GroupNumber and ElementNumber) and then 
show them without copy the name of the second element name.

I have this file:

<VLPhotographicImageIOD xsi:noNamespaceSchemaLocation="vl_iod.xsd" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
    <PatientIE>
        <PatientModule>
            <PatientsName ElementNumber="0010" GroupNumber="0010" 
Name="Patient´s Name"/>
            <PatientID ElementNumber="0020" GroupNumber="0010" Name="Patient 
ID"/>
        </PatientModule>
    </PatientIE>
    <StudyIE>
        <GeneralStudyModule>
            <StudyInstanceUID ElementNumber="000D" GroupNumber="0020" 
Name="Study Instance UID"/>
            <StudyDate ElementNumber="0020" GroupNumber="0008" Name="Study 
Date"/>
        </GeneralStudyModule>
        <PatientStudyModule>
            <AdmittingDiagnosesDescription ElementNumber="1080" 
GroupNumber="0008" Name="Admitting Diagnoses Description"/>
            <PatientsAge ElementNumber="1010" GroupNumber="0010" 
Name="Patient´s Age"/>
        </PatientStudyModule>
    </StudyIE>
</VLPhotographicImageIOD>

And I want the other xml document in this way:


<StudyDate ElementNumber="0020" GroupNumber="0008" Name="Study Date"/>
<AdmittingDiagnosesDescription ElementNumber="1080" GroupNumber="0008" 
Name="Admitting Diagnoses Description"/>
<PatientsName ElementNumber="0010" GroupNumber="0010" Name="Patient´s Name"/>
<PatientID ElementNumber="0020" GroupNumber="0010" Name="Patient ID"/>
<PatientsAge ElementNumber="1010" GroupNumber="0010" Name="Patient´s Age"/>
<StudyInstanceUID ElementNumber="000D" GroupNumber="0020" Name="Study Instance 
UID"/>

What shoul i do?? Thanks.

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