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The logical model approach aims to standardize all references to EHR data, by specifying a common logical information model upon which all CDS rules are defined. This enables CDS rules to be shared and reused in different physical implementations. However, an additional transformation is usually required for each physical EHR store, to convert the logical references into physical ones. Examples of the logical model approach are presented in section 4.2.1. Standards for Accessing Clinical Records.

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