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5.8 The Option hidden

Some grammars can produce very large feature structures, so it can be useful not to show the values of some specified attributes. To achieve this, use the option hidden. You can give any number of arguments to this option. The following arguments are available:

+attribute-name
The specified attribute name will be put in parentheses if it occurs in a value; the attribute value will not be shown.
-attribute-name
The specified attribute will be shown completely again in the future.
none
All attributes will be shown completely again in the future.