You have designed a pristine Domain-Driven Design (DDD) model. You have ubiquitous language, bounded contexts, and aggregates that perfectly model the business intent. Then comes the requirement: "Sync this with the Mainframe," or "Fetch inventory levels from the 15-year-old SAP instance." Suddenly, your clean domain entities are polluted with properties like KUNNR_Z01 or string-based status codes that only make sense if you have a CSV lookup table from 2005 on your desk. This is the death of a domain model. When you allow external implementation details to dictate your internal domain structure, you fall into the Conformist pattern. You need an Anti-Corruption Layer (ACL). The Root Cause: Semantic Coupling The problem isn't just that legacy variable names are ugly. The problem is Semantic Coupling . Legacy systems often flatten complex concepts into single database tables or cryptic XML structures to save space or satisfy ancient architectural const...
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