[Biojava-dev] Chain name vs id

[Spencer Bliven]

I have questions about the new chain id/name system post-#469.

- Are all Chains guaranteed to have an ID defined? What about a name?
- Are IDs set for structures loaded from PDB?
- Are IDs guaranteed to be unique within a Structure?
- Are all groups within a Chain object guaranteed to have the same ID?
- How are cases where the id and name differ mapped to chain objects? Is a
new chain object created for every tuple (id,name) that has groups defined
in the file?
- Should the chain selection syntax (e.g. "4hhb.A") refer to ID or name?
Should it be specifically restricted to polymer chains (with ligands
automatically added from all chains based on proximity)?

-Spencer
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