[tag] expression

Derivative expressions w.r.t. a differentiation variable. Outer vector is an unordered set of (Variable, expressions) pairs. Each pair's second element holds multi-component expressions, corresponding one-to-one with the input XML entries, e.g.:

<dvalue>
  <variable>T</variable>
  <expression>df1/dT</expression>
  <expression>df2/dT</expression>
</dvalue>

Additional info

No additional info.

Used in the following test data files

Used in no end-to-end test cases.