* Documented the `--query' operation.
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</para>
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</listitem>
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<listitem>
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<para>
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Unify the concepts of successors and substitutes into a general notion
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of <emphasis>equivalent expressions</emphasis>. Expressions are
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equivalent if they have the same target paths with the same
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identifiers. However, even though they are functionally equivalent,
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they may differ stronly with respect to their <emphasis>performance
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characteristics</emphasis>. For example, realising a slice is more
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efficient that realising the derivation from which that slice was
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produced. On the other hand, distributing sources may be more
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efficient (storage- or bandwidth-wise) than distributing binaries. So
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we need to be able to attach weigths or priorities or performance
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annotations to expressions; Nix can then choose the most efficient
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expression dependent on the context.
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</para>
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</listitem>
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</itemizedlist>
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</appendix>
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