A procedure is needed to ``store'' each basis variable into the concrete data structure. The ``stored'' variable must not affect the value of any other basis variable.

• Transfer variables are variables of the abstract type that directly correspond to concrete data fields.

• Create a set of basis equations by running the var-defined procedure for each basis variable.

• The set xfers is computed: the subset of transfer variables that depend on the basis variable to be stored.

• The set dep is computed: the subset of the basis variables that some member of xfers depends on.

• Create a procedure that computes dep (minus the variable to be stored) from the concrete data structure, then computes each member of xfers and stores it.

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