Add incoherent thoughts about DSL operator semantics.

diff --git a/docs/operator_semantics.txt b/docs/operator_semantics.txt
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+- fftbox
+
+Conceptually, this is a block-wise operator. However, it is just a
+spatial restriction that can be applied on a per-point basis, but
+requires point co-ordinate information to do so.
+
+- *
+
+The scaling operator is point-wise and does not require access to any
+index values.
+
+- reciprocal
+
+This operator is block-wise. Since we intend to implement is as a black
+box, we need to incorporate reading into and out of a buffer passed to
+a FFT implementation.
+
+This operator will define new output indices.
+
+- laplacian
+
+Like the fftbox operator, this is conceptually block-wise but can be
+applied on a per-point basis.
+
+- inner
+
+Operates on blocks, can be applied point-wise. Is the only operator we
+currently have that binds spatial indices together. Typically will
+require one of the operands to support random access. Which one should
+be a choice for the compiler.