There are several usage patterns for domain-specific languages: ? processing with standalone tools, invoked via direct user operation, often on the command line or from a Makefile (e.g., the GraphViz tool set) ? domain-specific languages which are implemented using programming language macro systems, and which are converted or expanded into a host general purpose language at compile-time or read-time ? embedded (or internal) domain-specific languages, implemented as libraries which exploit the syntax of their host general purpose language or a subset thereof, while adding domain-specific language elements (data types, routines, methods, macros etc.).
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