Can I have one XSLT style sheet which expands some brief XML to a longer
"normalized" form, which one of several other XSLT style sheets expands
further (or one of several parts of one sheet)?  Finally, I'll render it
with a CSS style sheet.  Or is there some other way one normally does
that?

E.g. in this xml:

<library>
  <author a_id="me" name="Myself"/>
  <series s_id="mine" name="My series">
    <by a_ref="me"/>
    <omnibus name="Foobar">
      <with>You</with>
      <novel name="Foobar #1"/>
      <novel name="Foobar #3">   <by name="Her"/> </novel>
      <novel name="Foobar #2"> <with name="Him"/> </novel>
    </omnibus>
  </series>
</library>

outer <by>s are inherited if there is no other <by> to use at a level,
while <with> adds a new <by> to the currently active <by>s.  Also, not
sure if I'll implement this but here author names not directly inside
<library> are dragged out to <library> and given an a_id.  So the above
expands to (maybe with numbered new a_ids rather than those shown here):

<library>
  <author a_id="me" name="Myself"/>
  <!-- Author IDs generated from authors without IDs: -->
  <author a_id="id_You" name="You"/>
  <author a_id="id_Her" name="Her"/>
  <author a_id="id_Him" name="Him"/>
  <series s_id="mine" name="My series">
    <by a_ref="me"/>
    <omnibus name="Foobar">
      <by a_ref="me"/>
      <by a_ref="id_You"/>
      <novel name="Foobar #1">
        <by a_ref="me"/>
	<by a_ref="id_You"/>
      </novel>
      <novel name="Foobar #3">
        <by a_ref="id_Her"/>
      </novel>
      <novel name="Foobar #2">
        <by a_ref="me"/>
	<by a_ref="id_You"/>
	<by a_ref="id_Him"/>
      </novel>
    </omnibus>
  </series>
</library>

which is then expanded further by some other sheet.

-- 
Hallvard