I can't see how it would be possible to transform a non XML document using
XSL, but I have heard of people writing pearl scripts that will take care of
placing certain portions into tags.  

Is this the sort of structure you had in mind?

<plant_item>
   <buffer_gas_system type="ABSTRACT">
      <centrifugal_compressor/>
   </buffer_gas_system>
</plant_item>

<process_equipment>
   <material_transfer_equipment="ABSTRACT">
      <fluid_transfer_machine/>
      STRING
   </material_transfer_equipment>
</process_equipment>


Jon


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