BibXML Service always make versionless call to datatracker

[kesara]

Describe the issue

When a query for I-D is versionless or the version is not found in the index, BibXML service makes a call to the datatracker ^1. This is versionless call (probably a DT limitation). Then look through DT submissions to get the latest I-D.

If there are multiple un-indexed versions, BibXML will fail to serve non-latest "un-indexed" versions.

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