Fig. 6From: Defining health data elements under the HL7 development framework for metadata managementThe work process of HCDM, NHDD and its implementation. There are mainly 6 steps for our work process: step 1 establishes the HCDM, step 2 extracts the initial DE, step 3 constructs the general DE, step 4 develops controlled vocabularies and domain Des, step 5 develops the web-based system and step 6 evaluates and optimize HCDM and NHDDBack to article page