Package: cxml-rng

Function pattern-except

Lambda List

pattern-except (instance)

Arguments

  • instance -- an instance of data

Return Value

a pattern, or nil

Details

Returns the data instance's except pattern.

In addition to a data type, data can specify that certain values are not permitted. They are described using a pattern.

If this slot is nil, no exception is defined.
  

See also

data
pattern