specification for sub query

Currently we are considering the specification that
can *not* represent the following query.

$B@h$[$I!"%/%(%j!u$G$O0J2H2q$O$G$-$^$;$s!#(B

ex.1) operations that use a bottle neck resource
ex.2) orders that are for first priority customers 

$BNc#1!K%\%H%k%M%C%/;q8;$rMxMQ$9$k:n6H(B
$BNc#2!KM%@hEY$N9b$$8\5R$N%*!H2q$r2DG=$K$9$k$K$O!"0J2<$N$h$&$J(B
$B%5%V%/%(%j!<$N;EMM$r@_Dj$9$kI,MW$,$"$j$^$9$,!"$A$g$C$H(B
$B<BAu$,$?$$$X$s$=$&$J$N$G!":#2s$O8+9g$o$;$h$&$H(B
$B;W$C$F$$$^$9!#!J%Y%s%@!<$N$?$A$P$G!"$$$d$=$s$J$KFq$7$/(B
$B$J$$!"$H$$$&0U8+$,$"$j$^$7$?$iDI2C$7$^$9!#!K(B

For ex.1)

<resource name="#query_01">
  <spec name="bottle neck"/>
</resource>
<operation name="#query">
  <assign resource="#query_01"/>
</operation>

For ex.2)

<customer name="#query_01">
  <priority><min value="0.9"/></priority>
</customer>
<order name="#query" customer="#query_01"/>

-- 
Yasu Nissy (Yasuyuki NISHIOKA), Dr.Eng.
MIT, 41-211
77 Massachusetts Ave
Cambridge MA 02139
Phone 617-452-2982, Fax 617-253-2249
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