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In the ODM, there are many instances where one element needs to reference another -- both within the same file and across files within a series of ODM documents. To accomplish this, the target element is given a unique "name" or Object Identifier (its OID). All elements that need to reference that target element just use its OID. Example: Say we have an item definition (ItemDef) called "Systolic Blood Pressure". We set the OID attribute of this ItemDef to "SBP". Then any specific instance of that data item (ItemData) can link back to the definition by setting its own ItemOID attribute to "SBP". |
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