functionDefn — Defines a function by associating a table with other information
functionDefn : [name]
(griddedTableRef | griddedTableDef | griddedTable | ungriddedTableRef | ungriddedTableDef | ungriddedTable)
(optional) - the name of this function definition
A functionDefn defines how function is represented in one of two possible ways: gridded (implies breakpoints), or ungridded (with explicit independent values for each point).
| function |