34 INTERPRETER
This pattern was previously described in GoF95.
DESCRIPTION
In general, languages are made up of a set of grammar rules. Different sentences can be constructed by following these grammar rules. Sometimes an application may need to process repeated occurrences of similar requests that are a combination of a set of grammar rules. These requests are distinct but are similar in the sense that they are all composed using the same set of rules. A simple example of this sort would be the set of different arithmetic expressions submitted to a calculator program. Though each such expression is different, they are all con-structed using the basic rules that make up the grammar for the language of arithmetic expressions.
In such cases, ...
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