Applying xsl to a resulttree.

Is it possible to apply the same template more than once to some xml? For
instance evaluating:

<calculation name="calc0" type="+">
    <calculation type="ref" ref="calc1"/>
</calculation>
<calculation name="calc1" type="-">
    <calculation type="value" ref="2"/>
    <calculation type="value" ref="4"/>
</calculation>

should be done by evaluating "calc1" first then "calc0" using the result
from "calc1". This could be done by having the rule that only calculations
with values are calculated when creating the resulttree. Iterating again
would suggest some new calculations only having values ("calc0" in the
above case). If this approach does not work is there another way of doing
dynamic programming with xml/xsl?



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