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A definition is a list of named items (which may be numbers, strings, lists,...).

definition definition(any,...)

Builds a definition with the specified elements. Note that the keyword definition is not in fact required:

my_field = (param : "z", level : 500, grid : [2, 2])

any definition[string]

Returns the value named by the input string from a definition.

level = my_field["level"]

Note the shorthand form of this, the dot operator:

level = my_field.level

Returns the list of keys (member names) in the given definition.