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- codes used to identify nodes are id-codes, not at-codes - only id-codes can appear in paths
- at-codes cannot be used for both identification and value set members
- at the top level, the 0-filled 4 digit pattern is gone, and all codes are always of the form xxNZZ, where N is a natural (non-zero) number, and Z is an integer. There is no longer any zero-filling, so now all codes obey the same rules throughout the archetype.
- the archetype root code for a top level archetype is now 'id1', and those of child archetypes are 'id1.1', 'id1.1.1' etc. The removes the anomaly that any code could start with a zero, other than dotted codes introduced at lower levels.
See here for the original work on this.
These rules have the effect that the codes of an ADL1.4 archetype are upgraded on the fly during conversion, as follows:
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