1. Constraint programming is an embedding of constraints in a host language . 2. Pattern matching can be easily implemented when as unification when the host language supports it. 3. Goethe Zentrum hosts language classes, European and Swiss cultural exchange programs and film festivals. 4. All teaching is in English but every student must learn French, the host language . 5. Rather, it is used to extend a " host language " with constraints. 6. The host language must also define " built-in constraints " over terms. 7. OMeta # uses braces ( { and } ) to recognize its host language in grammars. 8. The guards in rules are built-in constraints, so they effectively execute host language code. 9. When the host language does not support these features, they must be implemented along with CHR. 10. This is often done by embedding constraints into a programming language, which is called the host language .
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