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• Expression constraints may be used to constrain replacement slots of type id and scg,
• Value list constraints may be used to constrain replacement slots of type tok, str, int and dec,, dec and bool.
• Range constraints may be used to constrain replacement slots of type int and dec.

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Value list constraints can be used to constrain the possible values that may replace slots of type tok, str, int and , dec and bool.

For example, the following expression template uses a value list constraint to specify the possible definitionStatus tokens that may be used. The slot in this expression template may be replaced with either the token "<<<" or the token "===". 

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