Bisher:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<staff_has_fieldlist>
   <staff_has_field staff_id="2135" field_id="3" content="[email protected]" />
   <staff_has_field staff_id="4081" field_id="3" content="[email protected]" />
   <staff_has_field staff_id="4191" field_id="3" content="[email protected]" />
</staff_has_fieldlist>


<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<fieldlist>
   <field id="1" title="Alter" description="Das Alter einer Person" />
   <field id="2" title="Telefon" description="Telefonnummer" />
   <field id="3" title="E-Mail" description="Mail" />
</fieldlist>



So bitte umwandeln:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<staff_has_fieldlist>
   <staff_has_field staff_id="2135" field_id="3" title="Mail" description="Die Mailadresse einer Person" content="[email protected]" />
   <staff_has_field staff_id="4081" field_id="3" title="Mail" description="Die Mailadresse einer Person" content="[email protected]" />
   <staff_has_field staff_id="4191" field_id="3" title="Mail" description="Die Mailadresse einer Person" content="[email protected]" />
</staff_has_fieldlist>