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After the initial import, the §21 dataset would be represented in i2b2 in a very low-level format still close to the source CSV files: all coded items would just be displayed with their codes (and not the related names), and items that relate to large, hierarchical terminologies (e.g. ICD diagnosis classification) would be presented as very long lists. In a final post-processing step, the relevant standard terminologies (in this case ICD, OPS and G-DRG) as well as §21-specific codelists (e.g. for admission type, clinical service) are imported and merged with the dataset to provide a well-structured and human-readable hierarchical representation of the dataset.