Whats the difference between a pattern language and a set of patterns?
A pattern language is a set of interrelated patterns, all sharing some of the same context, and perhaps classified into categories. This term is due to Alexander. Alexander’s use of the term “language” is unconventional but not wrong. If you squint at and overformalize them, pattern entries are “production rules”. If you remember your automata theory, you’ll recall that sets of production rules are one way to characterize recursively enumerable langauges. • Why aren’t there more patterns about [WHATEVER]? Because you haven’t written them. If you’re interested, you more than likely know something, and if you know something you can write patterns. • How do I go about writing a pattern? Here are some common recommendations: • Avoid writing about patterns; just write patterns. • Pick something you know about and then find multiple occurrences and/or descriptions. Or conversely, mine existing software for new possible patterns. • Find out if other people have written similar patterns •
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