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1. Maintain and do not alter the semantic meaning of the questionnaire.
Principle 1 is the overall aim of CLOSER's metadata ingest project and therefore the most important. CLOSER's target is to generate a search engine containing every instrument used by 8 individual longitudinal cohort studies. The search engine, often referred to as the CLOSER Discovery, is designed for examining the logical flow and semantic meaning of the instruments. Therefore Principle 1 has to be kept to at all times.
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