1. A system for user customization of clinical data objects using a clinical modeling language, the system comprising: a processor and a memory to implement: a constraint definition language processor to define a detailed clinical model to express a clinical concept as a standardized and reusable set of clinical knowledge, the constraint definition language processor using a compiled, context-free constraint definition language to define the detailed clinical model as a compiled object, the constraint definition language processor providing the compiled object as content for at least one of a clinical content database and a clinical information system, wherein content represents one or more parameters to instruct a clinical application.