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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 (OID). All elements that need to reference that target element can use the OID to refer to the object. Example: Say we have an item definition (ItemDef) with a Name "Systolic Blood Pressure" and OID "SYSBP". Any specific instance of that data item (ItemData) can link back to the definition by setting its own ItemOID attribute through the ItemOID being set to "SYSBP". |
The OIDs used have to be unique, but only within certain contexts. The uniqueness rules are:
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