The following structure is utilized in the functions:

UF_DIE_create_binder_wrap
UF_DIE_edit_binder_wrap
UF_DIE_ask_binder_wrap
UF_DIE_free_binder_wrap

NOTES:

The value character strings in the below structure can be a numeric value (e.g., "25"),
a fully defined expression (e.g., "p5 = 25"), an existing expression name (e.g., "p5"), or
an expression string (e.g., "p5+p7"). If the fully defined expression exists then an error
is returned. If the expression name does not exist an error is returned. In all other cases
an expression is created. When this value is returned from UF_CURVE_ask_trim, the character
string is a fully defined expression (e.g., "p5=25").